The early rear end on a stepside these would be tight, just my opinion.
https://www.amazon.com/Ridler-Style-.../dp/B004X5YA9A
It looks like the rear wheels are 6mm offset. So, 5" BS would be very close. ( 0 would be 4.75, +6 would be around 5" BS )
If the truck is lowered any at all, honestly I'd find different wheels. I think they'd be tight. Stock suspension I feel like you'd be ok, but they are going to be on the edge of the fenders. Step sides are a bit different than the fleets.
As mentioned, 5"BS on a late housing is OK for a fleetside IMO (I do 5.5 on a late housing, and 5 on a early housing Fleetside.. 6" if it's a big static drop or bagged) 10" wheel.
Just my opinion.
I'd see if the seller would let me slip one on the back and just test it before I bought them. It's gonna be snug.. but may fit your tastes perfectly. Me, I like them to tuck under the fenders slightly but to each their own I guess. I like em all!!
Good luck man. Hope this helps.
__________________
Chad
1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway*
1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold *
Pride and Joy
1986 Silverado Short Fleet -
Scarlet *Sold*
1985 Silverado Short Fleet *Sold*
2022 Jeep Gladiator Mojave
2001 Jeep Cherokee XJ 4x4 - Lifted, Built
1992 Jeep Cherokee XJ 4x4 - Lifted
2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)