R7, R8, and R9 shifters work great with Shimano derailleurs but I would consider upgrading your rear wheel/hub/cassette to 9 speed before purchasing brifters because the selection, availability, and cost of 9-speed parts is much better. The brifters are still available on aliexpress but they might have changed the Microshift brand name to something different but similar. It's easy to find used 9 speed components for dirt cheap at your local bicycle cooperative or from ebay. On the other hand the R7 brifters are only about $35. The Arsis shifters have a weird variable pull ratio to make them compatible with newer mega-sized cassettes so don't go there.
Last edited by Clem von Jones; 03-22-21 at 01:36 PM.