66 C10 parts

[at38b]

Hello everybody, newbe to this forum, not new to the old Chevy's though.
Picked up a good 1966 runner, 250, three on the tree, long bed. Somebody before me installed a four speed box, dicked up the drive line etc etc..
Anyway I'm in need of the shift arms that are attached to the transmission that link to the shift rods. I've checked everywhere online, if I need to buy another box to get these so be it. Yes it's a rust bucket so to speak, but for now it needs to be a daily driver. In the process of a front disc brake conversion, 1993 1500 will be the doner for the parts. As the drums only have an adjustment hole in them and not on the backing plate, so the aftermarket ones have no adjustment hole in them. Anyway, if anybody has an outlet/source for the trans arms, would appreciate any info.
Thanks for your time,
Jeff