Re: looking for 21 pitch for 140hp
I have a stock 21 pitch aluminum in my garage. Give me a couple of days and I will send you a private message with the part number. IF you can afford it, Stainless is the way to go, and while I don't have one of them, the numbers increase in order so by looking at a 17 and 19 pitch I can tell you the number of a 21.
I also have a stock aluminum 23 or 25 pitch--I forget. Blades just miss the exhaust snout. I won't sell it but at least you know they were made. Perhaps someday I can take a photo of it and post it.
Believe me: Once you use a stainless prop, you will not want to go back to aluminum. They do run about 400 RPM and 2 MPH faster.
First google Chrysler/Force propellers on ebay. I know there are a couple there through dealers, but they are a bit pricey--even for the aluminum