Seal kit for power steering box?

[blue 72 gmc 4x4]

The power steering box on my 72 GMC is leaking. I went to napa and I cant buy just seals..I have to buy a whole rebuild kit and its like $60 and the box is perfectly fine, except its leaking. I just need the pitman arm shaft seal and the seal thats on the top of the box, I think its called the worm gear seal or something, its the one thats leaking the most. Does anyone know where I could find just those?? I looked at LMC and Brothers but I couldn't find anything on there. I just may have to call them, but I thought I'd ask and see if you guys new of anywhere.

Thanks!