I'm not sure what you're working on, but if you want to scale up, I've got a factory reverse OS 40FSR I'll sell.

Hi Bill,  it's not carrier but an All American Sr. with big offset wing.  An OS-FP might work but FSR is "just a little on the heavy side".
I wish Ebay had a Wanted to Buy section.

   Fox used to advertise them and were on almost all of the parts listings that I have ever seen, but they must not have made very many because you just don't see them. I wouldn't mind finding one or two, and keep a look out for them, for a little pet project that I need to get to some day soon. Either that or a lot of them got scrapped some where along the line. MECOA doesn't list them and they don't even have stock crankshafts.
   Type at you later,
    Dan McEntee

Frank, the Fox .35 (13500) part number for the reverse rotation crankshaft is 13528.  The normal rotation crank is 13508.  I tried to buy one from MECOA only to be told by Randy Linsalato that the last one had been sold a month or so before my order several years ago.  Unless he's started making them, the only possibilities are NOS somewhere, or a used one.  Good luck.