How to find lower ball joints??????????

[tdub19]

Okay i purchased some new lower ball joints for my 69 from OReileys and the fell right through the hole i pressed the old ones out of. So i returned them and they couldnt help me find out why they didnt fit. Then i went to autozone and they gave me ball joints that bolt on (similar to upper ball joints) They didnt know why they looked like that. So where am i supposed to find lower ball joints that will fit into the hole that i pressed the oem joints out of? Are these aftermarket joints supposed to go on a different way. Thanks for any help