Repro buttons are not the same! There is a guy on the samba machining new horn bosses, but other than that I believe you will have to find original parts. Good luck

FYI, there is no such thing as a 14" EMPI GT wheel, only 380mm (14.96") and 400mm (15.75")
Thank you for not refering to it as a GT
V wheel! That is annoying!