When we ran a full service chassis fab/turn-key hot rod shop a number of years ago, it was always useful to have threaded things around to weld into the frame for some kind of mount, etc.
Here’s a list of all our threaded things for your reference:
Rack Spacer Kit
Product Details
Brand: Welder Series
MPN: 24410
Bolt Size: 5/8"
Diameter: 1-1/2"
Length: Spacer: 3/4"
Rack mount spacers must be used with 1979 and newer power racks to move the rack centerline to the same position as the stock 1974-78 rack.
The spacers also provide extra clearance for the power rack input shaft casting.
Parts Included:
Spacer, 24400, 2
Bolt, 5/8-18 x 4-1/2″ long, HC-205, 2
Washer, 5/8″ bolt size, PWZI58S, 4
Nut, 5/8-18 nylok, HN-188, 2