"I have 1991 DP-A drive with Aluminum A1 series duo props. 1 prop is 3 bladed the other 4. I want to go to a same pitch and dia. SS equivlent set of props but I don't think they exist for this drive. The SS C-series from VP start at C2. Is there a C1? Both props are 3 bladed on the SS series also. Can I go with 2 SS 3 bladed props even though I have the 3,4 set up now in AL now."