Regarding the 57 fender emblems as Bartamos noted. If you turn them over, near the casting number they have cast marks "R" and "L". Not too difficult to figure out. However, there are many on backwards.
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