Just got back from Bama. The size required for a "Smitty" is:

1 1/2" x 1 3/4" x 5".

This will accomodate a commando or finger grip handle with no problem. Price will probably run around $550. Gene Beal or myself can help you if you have not already found a source. Hope this helps.
Best, Capt. Chris
_________________________
Capt.Chris Stanaback
RKCC/RKCA Founder
RKS #016
NRA Lifetime Member
CAPTSTANABACK@aol.com
WEBSITE: www.captstanaback.com