If they are the ordinary bulks like this:
then yep, they will fit just fine.
You can use Mike's output shafts too yes, just like I did:
clicky
As for which is best... I'd say they are about even really. The hybrid bulks will be a bit lighter, but if you damage them you have to replace a larger part vs just one cheap bulk. The UE diff cup is aluminium ( ofna spider technically speaking... ) so will be a bit stronger, but its rare that you will see a broken HB diff using a plastic cup. $$$ wise, they are pretty even, being equally expensive
