A body Kelsey Hayes lower balljoint part # 7183/7184

I am rebuilding a set of Kelsey Hayes 4 piston brakes and the lower balljoints are stamped 7183 and 7184---when I search the part # nothing shows up on the web --are they correct for 68-72 A body

Don't know about part numbers, but easy to tell if they are drum brake, or disc brake lower ball joints.
Measure the mounting bolt hole diameters.
1/2 inch, Drum brake.
9/16 inch, Disc brake.

thanks for the reply---they bolt up properly with 9/16 bolts--it is the part # that is bugging me because all replacements only ave 3 #'s