To add to the previous pictures, here are some shots of the gasbox 2:1 and muffler mounted on my wife's 1967 XLH.
There's plenty of kicker clearance -- though everything is a tight fit.
Also, the rear end of the header is slightly misbent. It kicks the tail of the muffler in 1/4" and up 1/4". This seems very small -- but if you run low road clearance shocks you may find the swing arm/backing plate coming very, very close to the muffler. I simply released the muffler to header clamp from the support tube and spaced it a bit further out to give me plenty of clearance.
However, on the final install I did run into very, very minor interference between the right foot rest support and the pipe. It needed between 1/16 and 1/8th more room to fit without touching. I marked it and literally beat the nuggets out of it with a peining hammer. Took more blows than you'd think to bend it inwards.
Anyways, I've got zero complaints. All the clamps are also gas box repos -- the muffler support tube is NOT the correct one. It's a generic 65 and up style for dual independents.