"I might try an inexpensive V-3 that has a height of 5.5"."
There's a very big difference between the V-3 and the V-5. Have a look at listing lis7gccg. Its for a pair of Pass Aleph 0 mono amps. I used to have a pair. If you are able to work with their size, I think they're a much better choice than the V-3. For the price and condition, you can't go wrong, and should have no problem getting all your money back if you sell them.