Adapter for a Helios 44M-4 lens?

[digifruitella]

So I'm aware that I need a 42M Adapter to use this lens, but wanted to be sure if there's a specific one that I should be getting or whatnot. I heard that it should be Canon EOS 42M, would anyone of these off of ebay will do?

Thanks

 

[chriscurl]

I got mine from these guys, works fine: http://myworld.ebay.com/fotodiox_gear I think I got the ones that are around $20