Took it all apart and measured the belt that was kind of in good shape.
It is 10.4", so 10.0" should do the job.
The whole clutch mechanism fell in the box and luckily got all the components and put them together.
It was a spring loaded contact wheel.
No exploded view pic for the clutch in the schematics. I was left to use my good judgement. There is a teflon washer in the clutch and I am a bit confused on where it goes.