Brown ti distributor cap

[Lynn]

I have an NOS (maybe technically not, as it was used on a test engine - one dyno run) Brown distributor cap that I got with an old very complete nos ti set up (same scenario - dyno run).

Apparently there is a huge difference in the value of the cap depending on whether it is a short cap or the tall cap. Found these two auctions on ebay:


http://www.ebay.com/itm/Corvette-Brown-F...3f0&vxp=mtr


http://www.ebay.com/itm/64-65-Corvette-F...p;vxp=mtrAnyone know the measurements?


Not that either of those is worth the asking price....

How can I tell the difference?
Anyone know the actual measurements?