GLTHFJ60
Stupid is as stupid does
Well that makes it a bit more difficult. I threw away all my old tires....
Yeah, you're gonna have to break a tire down to take your measurements.
That is assuming the Hutchinson inserts are rubber like the h1 ones are. If the hoops were rigid plastic or metal you could take your measurements from that, but if not, then you have to take your own. If the insert width is wrong, either its too narrow won't hold the beads in place and not do its job, or it's too wide and you won't be able to tighten the wheel down.
Reference; they make the h1 inserts to your specific tire.