Foxcraft with accessories and instructions
seem reasonably priced
https://www.kijiji.ca/v-auto-body-parts/hamilton/pontiac-fenders-skirts-never-used/1402444584?enableSearchNavigationFlag=true
That is a super low price for them. I have seen used rusty stuff for more than that.
1957 Pontiac Pathfinder Deluxe sedan restored 261 six
1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8