Spacer

I have a K75 Ultima which has 3 spoke cast wheels, there is 2mm thick spacer to off set the rear wheel so the tyre shouldn't rub on the swing arm, I have put another spacer (which I made) along side it so it now has a 4mm off set, do they do spacers of a deferent thickness ie 4, 6 or 8 to accommodate deferent tyres size

I've only ever seen 2mm spacers listed.

However, I have seen the problem of swingarm clearance solved like this:

Thanks Mike
looked on Motor Works site it lists the spacer, but asked for thickness, phoned them up they said for that bike 2mm, Ok but have you got any thicker, he said he didn't know?, so why are you asking for thickness, he didn't know, OK thanks and hung up
May have to go with two spacers and buff the swing arm