Janus has it correct, but a bit confusing to me.
The original tower is one piece, while the new tower system uses two pieces -- the bulkhead and the CF tower -- to go in the same spot and do the same thing. You do not use the new bulkhead or the new tower with the original tower. The original tower is less expensive than the bulkhead & tower combo, and we still have original towers available. All Kits now come with the 4-Gear and new bulkhead & tower as standard.
The two towers, #3310 (original) and the combination of #1310 (new bulkhead) and #3311 (new C.F. tower) are interchangeable. We made it that way so all customers can fit either one to any car.
The original transmission and the new 4-Gear both work with either tower system. If you use both original parts, they fit right together. If you use all the new parts, they fit right together.
If you interchange, using either the original trans with new tower or the 4-Gear with the original tower, you must make an adjustment in your trans height shims, but it all fits together and works perfectly.
I hope this fully explains...
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