What type of lens will fit a Canon AE-1 Program film camera?

I need to find some lens covers and I don't know what I am looking for as far as sizes go

The Canon AE1 uses the FD lens series - here's a website with lots of resources for FD lenses:
http://www.mir.com.my/rb/photography/com...

To cover the rear element you'll need a Canon FD mount rear element lens cover. Since Canon abandoned the FD mount in 1987, you might have to look hard. For the front element lens cap, check the diameter per lens.