I've contacted Academy several times regarding replacement parts and have always had excellent results. Actually, in the US, MRC is the Academy distributor (along with Italeri). What I always do is send the original proof of purchase barcode cut from the box top attached to a simple letter containing the parts I need along with my mailing address and contact information directly to MRC. Their address is: Model Rectifier Corporation, ATTN: Replacement Parts, 80 Newfield Avenue, Edison, NJ 08837.
If they have the parts readily available, which, in my experience, they always have, I get the parts within two weeks delivered to my door.
Hope this helps!