Notes on the many posts in this thread:
On bigger tires for the Mangusta, remember the bare chassis on display at Geneva '65 had 8" x 15" front wheels and 10 x 15" rears- no tires. There were 15" Goodyear Blue Streak racing tires back in the day that would fit them. Knowing DeTomaso never threw anything away when he could sell it to someone, that race chassis may have become a '65-'66 Mangusta.
10x 15" rear wheels also showed up on the restored version of the one-off Mangusta Spyder #8MA0912 back when Steve Nanny owned it. Also heard a rumor that a second Spyder was found in Portugal awhile back. No photos so dunno what wheels THAT one carried or what serial it has- if its even real.
I have a record of #8MA1302 as a right hand drive car somewhere in OZ, from a few years back but no owner listed. That should be car #402 as Steve said. A bunch of us got into the storage unit during the factory visit 1996, and there were at least 5 sets of front and rear Mangusta body-clips stacked on top of each other. Certainly wouldn't be impossible to fabricate a 'few' continuation cars from left-overs.