Just to update: found the pins (correct diameter) from McMaster. Had a machine shop cut to the appropriate length and cut the groove. Works fine. I ground some of the round head down although don't think it was necessary. Also, the rear drums could not be located anywhere. I wound up replacing the rotors from Jims classic trucks and had the shoes relined by a local shop. I think they put too much pad on them as I could get the parking braked to fit so just decided to not use. Rather have more pad than parking brakes.
