What I took out of my '94 Bounder measured 1 & 1/4". If they changed, they must have changed to 1 & 1/4" sometime in the early '90's. Which makes sense since the 1 & 1/4" stuff is just right. Though I think either size would work fine.
It would be great if those folks finding T-moulding online and posting links here, could find a place that sells it in 25' rolls, instead of 250' rolls. Most of us don't need all that much.
I have replaced all my moulding (but that company seems to be closed now) and don't need to know...but I bet lurkers might benefit.
BTW, when I decided to replace my old cracked and broken off moulding, I could only find it at RV dealers, at $6/ft. One place asked $11/ft. Just think of it, asking $150 for what cost me $25. All it took to install was a sharp pair of scissors, a knife, and a rubber mallet.
Thanks!