To my knowledge, all B7100s had optional front-end-loaders (FELs).
If you have the older gear-drive model
B7100, you definitely won't find any new ones out there and it is doubtful that you would find any used ones (unless WVBill wants to sell his off his
B6100...)
If you have the newer hydrostat model
B7100, you will still have problems finding a NEW Kubota brand loader (models B1630 or B1630C), but there are used ones available. I believe that Woods still advertises having a new loader for the
B7100 hydrostat.
Note that the FELs are different for the older style
B7100 and the newer style
B7100 (which is why Bird was asking...).
The good news is that parts will most likely be available if you find a Kubota brand FEL. I have never had any problem finding parts for my older
B7100 and Kubota accessories, I just couldn't buy any NEW stuff complete (mid-mowers; FELs, etc).
Hope this helps,
Kelvin