72 C10 with 92 stepside bed wants mod

[mechanicalman]

Hi everyone. I have obtained a 92 step-side bed to install on my 72 SWB Chevy. I'm doing some basic fiberglass repair to the damaged bedsides from previous. I checked out a lot of pictures of this style bed on 67-72 trucks and the only thing I don't like is the semi-squared out wheel openings.

Has anybody out there modified those to match the rounded front wheel openings? Is there a "patch in" style kit for that? It would be nice to do the mod on top of what is there and then cut it out. I'd like to get all the fiberglass work out of the way at the same time.