Does anyone know how the large slipper pad that wraps around the swinging arm is held on. They look like giant pop rivets to me , but are they?

Thanks

Yes, they are pop rivets.

The parts book says the size is 14x4 8x21 whatever that means. Probably a 4mm rivet with a 14mm length or grip length and an 8mm diameter head.

You'll just have to drill them out and try some. I had a feeling that the new rubber chain guide may even come with those rivets but don't hold me to that.

Chris.