According to campy's spare parts manuals for 1994 & 1995.

https://www.campagnolo.com/media/fil...994_part_C.pdf

https://www.campagnolo.com/media/fil...995_part_C.pdf

They use FH-RE006 (1/4") on the non-drive side and FH-RE004 (7/32") on the freehub side for the rear.

And if the drawings are accurate 9 and 10 respectively.

Front uses HB-CH002 (3/16") 9 per side. Again if the drawings are accurate. 3/16" doesn't sound right to me. But that's what my search came up with.

Measure what's in there to make sure.