It should only take a few phone calls to find out of the parts are available or could be ordered by a local shop, and that might be worth buying locally even if a few bucks more. In a pinch, it's normally better to know where to go locally, and at the same time you might find out how does the best work on Atomic 4s in case you need help.
If you haven't yet, search the boards at Moyer for stories and directions offered by others who have done the work you're doing. You might find enough details there. If not, consider spending the $$$ on the manual offered by Moyer.