If you know the brand of SYE it would help by getting in touch with said company. I can't tell you if they are all interchangeable.
If you got the new route, pick a good company like JB or AA. I have the rugged ridge with no issues, but wish I went with one of the two I mentioned for peace of mind.
For the DD I suggest an ARB or OX Locker selectable locker for the front
~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
... and NEVER will be