Mac cat-back 3.5" tips

Sorry if i seem stupid, but i cannot find the 3.5" tips on the site anywhere...i've looked before and all i can find are the universal tips which are different. i know they have 3.5" tips for the 2.5" cat-back. do i need to call them? thanks for the tip on taking care of them...i'm actually getting them for summer tips and the 2.5" will be winter.