The B7100 had 3 loader options
B219 – rigid loader that was self contained and had its own hydraulic pump running off the front of the crankshaft.
B1630 – rigid loader that ran off the tractor hydraulics
B1630C – basically the same as the b1630 but was considered a quick disconnect at the time. This was the only loader that you could use the mower deck and loader at the same time.