So if I am understanding correctly the 2L Euro 75 Twinspark used a 4x98 offset with 4 lugs and a 14" wheel?
If correct, I assume a stock early Alfetta ATE caliper could be used with a spacer added with the 2L Euro 75 Twinspark vented disc brakes? In addition the 75/Milano aluminum Brembos from the 2L Euro 75 Twinspark will work, but did Alfa use spacers in these calipers as well to get the vented rotor to work?
ts used a 5 x 98 bolt pattern. I cannot say if the disc/caliper is a direct swap, but probably yes, ast the lugs are fitted to the disc itself and the overall height of the discs is unchanged.
this is the drawing of the non-vented disc
Brembo | Aftermarket Catalogue
and this is the vented one
Brembo | Aftermarket Catalogue
since the calipers fitting point are of course on the inner side of the disc, if you add a spacer it will results in the outer half caliper moving outer. The only risck can come from the OD, but if it is a problem I think that any machine shop can put it on a lathe...
Just change the rims, there are plenty of them there out!
hope it helps