not going to comment on the lh vs rh issue here. however I made such a big mistake years ago when I sold my 05 supra ssv22. I had put a "wake prop" on the boat right after I bought it so the original was perfect. I have a evolution cover made ($1000) and the factory one was good. I ended up giving the buyer the extra prop (keyed vs splined on mc) and both covers.
I could have easily sold the evolution cover along with either prop for a extra $800.