MY EXPERIENCE...I used FedEx Ground a few years ago to get a rear spring from LA to NC.
They traced it as far as OH and it went off the radar, never to be heard from again; I would think a Model A rear spring would be pretty identifiable, but I guess not, even with labels all over it.
Fastenal has been very reliable and reasonably priced.
I had a small issue with a mid-west Fastenal operator, but when contacted by their regional office, they suddenly became very cooperative and everything went well from that point on.
I have used Fastenal probably 10 times since then with no problems, they are good shippers.