I have the OTC Stinger version. Bought it ~10 yrs ago. 6.25" and 5.12" outside dimensions as shown above. Mine is made in Taiwan. I bought a ton of OTC pullers and slide hammers ~10 yrs ago and it was almost all Taiwan or USA with global materials (Taiwan or China, I'm sure). The ball joint press was USA and not sure about the pitman arm pullers, but nothing was marked China FWIW.
And yeah, I have a few 5/8-18 coupling nuts to weld things to when the need arises.