PS2 to Dreamcast controller adapters

Just got a Dreamcast from a friend a whole bunch of shumps and fighters! It came only with the standard Dreamcast pad. I have a number of high end arcade sticks including the Hori RAP2 SA for PS2.

So i guess I’m looking for a controller adapter. Which ones should I check out? Ones to avoid? Places to buy them? Thanks for any help!

Check the essentials sticky. It has a link to everything you could ever want to know about converters.