Yes they are TRX, and according to one of our fellow alfa friends from Belgium - the wheels seems to be from the french company PLS, which GEMA often used as well as many other rally and racing teams in the eighties and beginning of nineties
This is the answer I gave earlyer this week to Xavier Havaux to his question if I reconised some wheels on a Luigi GTV6 ?
Also mentioned that I was not sure but thought they were PLS and had to check it .
Anyway the wheels are not PLS they are from ELIA .