I have the jotto short-stack...
I measured at one point my BC780XLT and BC785D - the width is almost dead-on with the 996 - but the 996 is just a hair shorter.
http://www.radioreference.com/forums/showthread.php?t=34529 <-- shows my setup and how close the fit is on the 780 and 785.
If you can tolerate a small , fine gap on the top or bottom, that would be the way to go.
The holes on the side are one long slot which will allow for adjustment of depth.
If you need a helpful rep there, ask for Keith, as he set me all up - heck, if need be, tell him to pull up Jonathon Whipple's order and see what mounts I used - there should be 2 of the same kind on my order - that would be the one!