yes there are several omc 15 to 25 hp racing engines and you can buy them straight from OMC the (15hp) and can even get a racing lower unit upgrade and come race stock outboard in 1 of the largest classes in stock outboard
I am not aware of these motors. Can you tell us the model number, price and how to order them?

I think you are referring to the out of production 15SS and 45SS which he already knows about, but can't buy "straight from OMC" or any other place except hunting down a used one.