So after measuring from outside to outside of swingarm, I am almost 1/2" more than what the housings measure. It says they measure 6.290", and that is just a tad over 6 9/32. So here is my dilemma, the swingarm needs to be about an inch shorter in width to be able to notch out the square tubing and weld the round carrier housing to.
I thought I'd cap off the ends of the tubing, weld the housing to that, then gusset on top and bottom of the housing and swingarm, and to the innermost side of the housing and to the inner walls of the swingarm. But, my only dilemma is, the brake caliper mounts. If that carrier does not allow for at least 1/4" on the right side, then the carrier brake caliper mounts will hit the side of the swingarm. I may be fighting with this if I do the round carrier...but i'll be damned if a round carrier whoops my ass!
I'll fab up something...