You're there in SoCal, surely there is a big manual trans shop that can get individual parts. Don't look for mom and pop shops, go for a bigger distributor that sells over the counter to the public too. Somebody there is bound to do it.
I remember Ford's exact same response for ATX parts, we sell the entire trans only, no rebuilds done anymore. I couldn't get parts for a six year old trans, they were all listed as NLA. I found a wonderful shop here that sells both new and used individual parts but a 40 mile drive.