cpp drop spindle and lower ball joint

[swanga c10]

Hi

Im installing drop spindles and disc brake kit from cpp on my 1970 c10 and have noticed the new lower ball joints wont pull all the way up through the lower hole on the new spindle. Is it possible they sent me the wrong ball joints or do i need to press these on?? i probably need it to pop though another 7mm.

any advice would be greatly appreciated.

regards
Ji