Question: I want to get FLM bulkheads with diff. case machined into the same piece, but there are two versions? which one will work with the stock gears out of an Emaxx 16.8?? (3905) I have two complete diffs from the 16.8 Emaxx, but i need to know which FLM bulkheads to get that will fit those gears. There is a $60 version, and a $70 "hybrid" version, the look exactly the same... Anyone know?