This set of (4) RL Drake Studded Feet for the AC-4 and AC-4 Power Supply and L-7 (rear feet), SP-75, CW-75 and P-75, are recently made with the same Specifications and size as the original feet used with RL Drake Power Supplies and Accessories.  They measure 7/16" OD, and 1/4" High.

They have a stud which is the correct thread to screw into the Drake AC-4 or AC-3 Power supplies to use them stand alone so they have feet and will not scratch surfaces.

They were also used to mount the AC-4 or AC-3 into the MS-4 Speaker. 

They were also used for the rear feet on the  L-7. 

The SP-75, CW-75 and P-75 used them for feet and to hold the cabinet on.

They are the same hardness (Medium Hard)  and look just like the originals.

Most of the originals have become flattened, hard, and brittle over the years. 

This brand new set with modern material will last for decades.