I recently changed a few different things on my commando.
1)I ordered an unpainted interstate tank from Ebay (india) which worked out fine for me, but it was not perfect. The filler neck's cap mounting hole which uses a roll pin was sloppy as hell. I drilled it, and the cap, out to the next size diameter pin and got it all worked out to my satisfaction.
2)I had my own oddessy painting the tank that I eventually got right. It was my fault because I was using paint which I was unfamiliar with.
3) the interstate tank did NOT have enough clearance with the early commando yokes (27 degree kind) which have less offset. I had to elongate the front bracket mounting holes to move the tank backward away from the yokes. I also modified the stops by adding additional metal stops to the fairing bracket I mounted on the bike to hold the fairing. The early commando yokes with less offset foul the interstate tank. That yoke can be identified because it has no bottom nut so it's smooth on the bottom side of the yoke, if you can't tell by the steeper head angle or less fork offset.
4)I mounted the clubman rear sets. they work OK. They took some getting used to, but I'm good with them now. I'm 6'2", so I wish they were mounted lower, but it doesn't kill me at all to ride in that position.
5) I have nearly flat, narrow bars. they are 24" wide and have a tiny rise to them. I like them. Mostly I don't have a garage, so I need extra narrow bars to get the bike into and out of the house... Not everyone has that problem, but I do.
You can definatly see that the back of the tank is really tight against the side covers and the low bars would foul the tank if I hadn't welded stops on the fairing bracket. I'm sure certain configurations work easily and other's don't.... As usual, I had every parts conflict permutation possible, but eventually I got it where it's "OK" for now....