Originally Posted by VegasTriker

It's not always easy to answer the question about comparability but sometimes going to the manufacturer's website you can glean enough information. https://bike.shimano.com/en-EU/produ...M3100-SGS.html This shows that this particular RD will work with a 36 tooth cassette. Are you looking for an indexed bar end? You need to be sure whatever you buy has the right pull ratio for this Shadow series 9 speed RD.

Sometimes it is possible to get a workaround for what you want to do. My recumbent trike had SRAM X7 drive components and I wanted to switch to a Shimano Deore RD. I followed some advice on the Sheldon Brown website to find a compatible RD and modified it with a longer "b" screw as they suggested. I did have to replace the SRAM bar end shifters with Shimano Dura Ace bar end shifters. It was a rather expensive conversion but I would still do it again.
Remember, changing the drive train to 9 or 10 speed means you will have to buy a compatible chain too.