you can use a Mx4 slipper on the older works lay shafts, I haven't tried to fit one on the Pavidis shaft which I think is the same as the later YR4 versions. That still leaves you with the problem of finding a Mx4 slipper which are just as rare.
You could try a MR4BX slipper (it has the same number of belt pulleys, 15t I believe) but that would mean getting a custom made lay shaft, but it would allow you to run associated spurs and pads. I actually considered getting this done at one stage, but I managed to get a few YZ 10 slippers on eBay.
Maybe RW racing would make a few up for you, drop them an email.
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