Lower A-Arm Shaft

[drogers]

I have a 1963 C10 that I'm working on. I'm upgrading to disc brakes and beefing up the suspension. (Hope that's enough info to start with)

My question is, is it possible to reassemble everything and then come back and replace this? I order all my parts before I started. Cleaned & painted and I'm ready to reassemble. I went to attach the lower a-arm and found that the seal that LMC sent me is not correct. I called them about it, and they said it's the correct one, no way. I'll get this figured out and the correct one ordered. I would normally wait, except my truck is parked right under the attic and it contains the Christmas tree and all the trimmings.

Is it possible to do this or should I wait? The seal on the left is the old one and the one on the right is the new one. The other picture is what's left of the front end.

Thanks for your help.