55.2-59 Parking brake

[chevyhed53]

Finished installing a 4speed in my '56 stepside ('70 truck chassis) which PO sold me with a 350TH. Everything working well, but I realize I really do need a parking brake. Poking around through the catalogs I see Lokar makes a bunch of universal under-dash units, but I don't think I've got room for it under the stock '56 dash. Not enough "lip" to support it, I think, and not enough room in front of the door. Found a Lokar floor mount in the Chevs of the '40s catalog, and wondering if anyone has thoughts about best way to go. I have a disc/drum setup, and the 4-speed is a rebuilt Saginaw. Thanks!