Get some Sugru and make your own! I wore through my thumb grip on my E-P5 and needed a new one. I removed the old one and cleaned all the adhesive off, put some Sugru on it and shaped it to my liking (better than the original, for me) and then took some crumpled then uncrumpled aluminum foil and lightly pressed it into it to give it a leatherette finish. Looked like the real deal, except it was fitted to my preferences and it's grippier then the factory rubber. It stayed on for a couple of years until I needed to replace the screen flex cable and I removed it searching for one of the 127 screws I needed to take the dang thing apart. I cut the majority off with a knife and scraped the leftover bits off with a plastic spudger.