If you’re unsure of which SRAM adaptor you need, use the images below to see the subtle differences between groupsets.
Universal Derailleur Hanger:
(The original part has ‘UDH’ printed on it and this is also used on bikes with Shimano groupsets)

Transmission GX:
(Also required for Force XPLR 13-spd, Rival XPLR 13-spd, Eagle 90, Eagle 70 & S1000)

Transmission XX/XO:
Also required for Red XPLR 13-spd

Still unsure? Get in touch hello@tailfin.cc