Sorry Griff, not ignoring you but I'm out and about. Legally and socially responsible, will add.
We are talking about the o rings which seal between the two pieces of the cam pulley flange?
If you have the pulleys in front of you you can measure the inner diameter of the o ring from the spigot of the cam flange. It seats where the screwdriver is pointing in the photo.
I'm pretty sure the ones I fitted were 2mm diameter.
But they are cheap so what I suggest is buying a few different section rings. Say 2mm, 1.5mm etc and try them. As long as the two sections bolt up without a gap between them I think you will have it covered. Obviously if they dont you will have too great a diameter ring in there.
When compressed they take on a different shape to the circular section, and they should fill the void between the two halves of the flange only.
You may actually find a suitable ring in one of these assortment boxes available from the likes of Screwfix. You can stretch them a little with out affecting their performance.
Any help?
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