I am looking for a used prop for my 1970 E35 MK II; repowered with a Yanmar 3 GMD. 3/4" shaft, Martec suggest a 14" RH x 14" dia. if I go with another folding prop. Have to trade/sell 1: 12"RH x 6P x 3/4" shaft fixed 2 blade and also, 1: Martec elliptical folding 12" RH x 6P x 3/4" shaft. Thanks...