Mark, I can't tell you the specific size, but the correct binder bolt is Campagnolo. There's a seller on on eBay that constantly lists them NOS for a $19.95 buy-it-now price. He says it fits a Masi, Colnago, etc. Here's the link:
Mark Winkelman
Dallas, Texas
USA
>I think I may have lost mine. Are they 8mm? Would they-if original, say
>Masi
> or Campagnolo on them?
>
>
>
> Mark Cutrufelli
> Laurel,Maryland
> USA
>
>
>
>
> _______________________________________________
>
> __________ Information from ESET NOD32 Antivirus, version of virus
> signature database 2984 (20080329) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com