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I've just checked the part numbers and it looks like the A5, S5 B8 & 8.5 Coupe and SportBack (it says not for Cabriolet) all have the same lower gearbox strut braces - both for manual and S-tronic - but the RS belly-pan cover won't fit without stretch bolts added to it-.
My 2010 A5 3.0TDi Coupe S-tronic is listed here:
gearbox | Audi Audi A5/S5 Cou.Sport. 2010, support frame transmission securing parts for 7-speed dual clutch gearbox 2.0/3.0 ltr
AudiA5COAudi A5/S5 Cou.Sport.2008 2009 2010 2011
(11)8T2399345Lstrut brace for assembly carrierrhd
(11)8T2399345K
Cancelled since 01.08.2011
strut brace for assembly carrier
D >> - 20.09.2010
rhd
(11)8T2399345J
Cancelled since 01.09.2009
rhd
I picked a used one up for a few quid and will swap mine out and add the extra strengthening struts like Karl did to his to it, as its invisible and I'm not bothered about the weight.

Here's the info on the LHD version 8T1/8K1 (as opposed to the 8T2/8K2 RHD version) from the Progressive parts website:
034Motorsport X-Brace Billet Aluminum Chassis Reinforcement, B8/B8.5 Audi A4/S4/RS4, A5/S5/RS5, Q5/SQ5, Allroad
Fitment:
  • 2009 – 2016 Audi A4 (B8/B8.5)
    • All LHD Models
  • 2010 – 2016 Audi
    • All LHD Models
  • 2010 – 2017 Audi S4 (B8/B8.5)
    • All LHD Models
  • 2013 – 2017 Audi RS4 (B8/B8.5)
    • All LHD Models
  • 2008 – 2017 Audi A5 (B8/B8.5)
    • All LHD Models Except Cabriolet
  • 2008 – 2017 Audi S5 (B8/B8.5)
    • All LHD Models Except Cabriolet
  • 2013 – 2017 Audi RS5 (B8/B8.5)
    • All LHD Models Except Cabriolet
  • 2008 – 2017 Audi Q5/SQ5 (B8/B8.5)
    • All LHD Models
Replaces:
  • 8T1 399 345J / 8T1399345J
  • 8K1 399 345E / 8K1399345E
Please Note:
  • Fits LHD (Left-Hand-Drive) Vehicles Only. Does Not Fit RHD (Right-Hand-Drive) Vehicles.
  • Does Not Fit Cabriolet.
  • The X-Brace will fit the Audi RS5, however, due to a variation in the belly pan, it will block some mounting points for the plastic shield.
  • We recommend using new factory stretch bolts to install the X-Brace. Complete factory bolt kits are sold separately below.
    • B8 (Pre-Facelift) X-Brace Bolt Kit
    • B8.5 (Facelift) X-Brace Bolt Kit
034-603-0008 – 8T1399345J, 8K1399345E
 

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I've just checked the part numbers and it looks like the A5, S5 B8 & 8.5 Coupe and SportBack (it says not for Cabriolet) all have the same lower gearbox strut braces - both for manual and S-tronic - but the RS belly-pan cover won't fit without stretch bolts added to it-.
My 2010 A5 3.0TDi Coupe S-tronic is listed here:
gearbox | Audi Audi A5/S5 Cou.Sport. 2010, support frame transmission securing parts for 7-speed dual clutch gearbox 2.0/3.0 ltr
AudiA5COAudi A5/S5 Cou.Sport.2008 2009 2010 2011

(11)8T2399345Lstrut brace for assembly carrierrhd
(11)8T2399345K
Cancelled since 01.08.2011
strut brace for assembly carrier
D >> - 20.09.2010
rhd
(11)8T2399345J
Cancelled since 01.09.2009
rhd
I picked a used one up for a few quid and will swap mine out and add the extra strengthening struts like Karl did to his to it, as its invisible and I'm not bothered about the weight.

Here's the info on the LHD version 8T1/8K1 (as opposed to the 8T2/8K2 RHD version) from the Progressive parts website:
034Motorsport X-Brace Billet Aluminum Chassis Reinforcement, B8/B8.5 Audi A4/S4/RS4, A5/S5/RS5, Q5/SQ5, Allroad
Fitment:
  • 2009 – 2016 Audi A4 (B8/B8.5)
    • All LHD Models
  • 2010 – 2016 Audi
    • All LHD Models
  • 2010 – 2017 Audi S4 (B8/B8.5)
    • All LHD Models
  • 2013 – 2017 Audi RS4 (B8/B8.5)
    • All LHD Models
  • 2008 – 2017 Audi A5 (B8/B8.5)
    • All LHD Models Except Cabriolet
  • 2008 – 2017 Audi S5 (B8/B8.5)
    • All LHD Models Except Cabriolet
  • 2013 – 2017 Audi RS5 (B8/B8.5)
    • All LHD Models Except Cabriolet
  • 2008 – 2017 Audi Q5/SQ5 (B8/B8.5)
    • All LHD Models
Replaces:
  • 8T1 399 345J / 8T1399345J
  • 8K1 399 345E / 8K1399345E
Please Note:
  • Fits LHD (Left-Hand-Drive) Vehicles Only. Does Not Fit RHD (Right-Hand-Drive) Vehicles.
  • Does Not Fit Cabriolet.
  • The X-Brace will fit the Audi RS5, however, due to a variation in the belly pan, it will block some mounting points for the plastic shield.
  • We recommend using new factory stretch bolts to install the X-Brace. Complete factory bolt kits are sold separately below.
    • B8 (Pre-Facelift) X-Brace Bolt Kit
    • B8.5 (Facelift) X-Brace Bolt Kit
034-603-0008 – 8T1399345J, 8K1399345E
Good info, thanks for posting

I need to source replacement sub-frame stretch bolts. Does anyone know the part numbers required for the B8.5?

EDIT

WHT005372 x2
N91151101 x4
 
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