What Bagger said. You need the trunk and it's mounting rack, then change the fender rails to the Interstate type. The easiest part is splicing 3 wires into your bike's wiring loom for ground, tail light and brake.
I've done it a couple of times, it's not hard at all, once you get the parts together.
I've never had any clearance issues between the rack and the tail light, but you never know, I guess. If you did, it would be an easy fix.

If you're lucky, you won't need paint, but don't be too choosey, good, complete trunks are getting harder to find

