I would say more the opposite. The GTI has 100mm but I think the A2s at least before 90 had 90mm. You can upgrade by swapping out the flanges and seals. The harmonic balancer on the passenger side of the 90mm are such a German rig job. They don't use them with the 100mm. I'm thinking of upgrading my 86 Golf to 100mm.
I think they have them. You can always call them.
You can buy used cheaper from a vw owner on VWVortex.com.
Who painted the car and how much was it? :)