Have you tried ... Ron Hill in Santa Ana? As much as I personally dislike the old SOB, he may be able to help. His son, Chad I think is his name is pretty helpful. If he doesn't have anything, try TNT marine services in Miami, Fl. I live not far from there. A lot of those semi surface drives still get used here, a lot! I had two on my formula 336 sr1. I loved 'em but your correct, props a tough to find. PM if you still can't find any, with Dia. And pitch you need. My neighbors up the street work for merc racing, he can get anything. Dean.