My first post!
I have just taken my M4s off my old frame, these forks are a work of art! I have the box and manual somewhere, I can scan it in if there's demand (it's quite long).
I bought them in 1995 from new, they came with some spare Yellow (hard), Blue (soft) and red (medium) elastomers. There is also a bottom out elastomer accessed after taking the circlip and the small screw from the bottom of the legs out.
I have searched and searched for new elastomers...anyone? Answer/Manitou were bang on it with the quality of these things, and home servicing too? what happened!