I found a wheel from a Fiero at Pick your Part. It has 3 spokes similar to the original wheel and has a slight dish to it. I replaced the horn cap with one from a mid 70's Camaro and used a bowtie emblem in the center. Also installed the stock turn signal cancel plate and it works well.
Fred

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine