Can you get spares for these? My left one clicks on every down stroke and it's really really getting on my nerves now.. I've seen replacemnt M540 axle/bearing kits but I don't know if they fit.

It probably just needs a re-grease, at worse you may have split ball bearing(s) which you can source from any bearing supplier.

3/32" bearings in there. My Ultegra pedals had a click so I whipped them apart, greased them and they run fine again.

Thanks – any idea what size the bearings are? I did pull the axle and re grease and its still clicking so I guess something needs replacing.. didn't see any ball bearings on pulling the axle. Actually, maybe thats the problem 😀