These wide 5 wheel adapters are 3/8" steel with 5/8" UNF studs. Adapts your "early modified" wheels to today's more popular bolt patterns.
Must use spacer with drum brake. The bolt heads on the back side of the adapter do not sit flush, contacting the brake drum. The thickness of the spacer would depend on the specific brake drum being used, but the 1/4" 916-58210 or 3/8" 916-58212 should work for many applications. Both of these spacers would work on the 916-58250 and 916-58251.
However, 916-58253 would require a 6-pin spacer #916-58220.