Aren't A-Body 8 3/4" axles supposed to be in demand?

I have a 65 Valiant convertible that has the ubiquitous 7.25 axle. I'd love to put an 8 1/4" axle in it but I can't seem to find one around here.
What about rhw other alternative 8.25 mopar rear? Still a viable option?:eek:
Same boat. Fine rear end. Would love to have put one in my boy's car. Hard to find in these parts. 8.8's are growing on trees. For now.