CPP mixed up order - now what?

[NC_John]

Like I've seen in another post or two, CPP also sent me the 73 and up spindles instead of the ones I ordered for my 70 with my disc brake kit. They also sent me the newer balljoints and tie rod ends. The guy I talked to said It was a shipping mistake but I basically got a free upgrade worth nearly $200 with the suspension/steering parts (that weren't included in the kit I ordered) and everything will bolt up fine.

All that may be fine and good but what happens later if I want to upgrade to tubular a-arms? Do I have to get newer ones and will they fit on a '70 frame?