I got the number straight from Oregon`s older catalogue, had same bar numbers as your bar has on it. No other source I now of for older Oregon stuff.It is a 3/8.
I don't wanna say it's not 135 but I had looked at getting some loops at one point and could only find one seller that had any because, and this is why I'm asking and what stuck in my memory, it was a funny number and different from what was readily available. I should have bought em, there were only 3 and they were on clearance.