Lower ball joint

Hey guys, went to napa today to get ball joints for my 97 z71. they have 2 of them. a 45mm and a 47 mm. they said the 45mm goes on a stamped arm and the 47mm goes on a forged arm. they couldnt tell me and i dont know how to tell, can i get some help with this? thanks

Remove one and measure and match it up.
Was the napa joints moog?
Have you checked the Moog listing on it to see if they show same thing?

Measure ball joint where it presses in.
Stamped/Welded joints will be 1.802 in.
Forged joints will be 1,885 in.