I remember seeing reproduction clamshell fenders for Cubs on a vendor's website, but for the life of me, I can't seem to remember the name of the site. Both fenders on my "new" '67 are rusted out.
I have never seen repro clamshell fenders for a cub, but that doesn't mean they don't exist. Why not put good, used originals back on it :?: I am sure JP Tractor Salvage or TM Tractor Parts have them available. Both are linked to this page if you need to contact them. 8)