Frankly I wasn't here for the parts although I have made a few purchases. A personal friend of mine ran a marine engine shop that carried the A-4. He gave me many spares and assorted original parts as I needed them in exchange for some valve guide tooling and tool sharpening.
What I enjoyed most about this forum is that I have a place to share my knowledge of engines with others "wanting" to learn. I know know how much my father and grandfather enjoyed teaching me from an early age and this site allowed me that experience. It also allowed me to learn of many of the A-4 idiosyncrasies, strengths and weaknesses while dealing with many wonderful people.
Thanx Don, Bill and the entire MMI Forum!!
Dave Neptune