I didn't know Warn even made a front shift option on the 33-29. I thought the front shift was only with the very early models like a 20-29. A front shift, as noted, will not work with the 4" index late D18 or D20 housings.
Best place for OD info is Herm's site
Herm Tillford is extremely knowledgeable and will take the time to talk to you and is ameanable to trading parts.
Besides, he has a nice looking 3B on the header
I see no information on exactly what you are working on but if your Jeep has the V6 (only ones that used the large index T case) and the optional 4.88 gears, it is the absolute best improvement you can make.
1955 CJ 3B, 381cid sbc (441cid all aluminum sbc coming soon), AGE M22W, Teralows, Warn OD, OBA, Premier Power welder, Warn 8274
1968 CJ 5, factory 225" w/ headers/450 cfm Holley, T86AA, Belleview winch, Warn OD
2012 Wrangler Rubicon Unlimited, Warn 9.5 xp-s winch