Is there a replacement carb for a mikuni vm30ss and would that be the correct carb for a dt360a Yamaha?

That is the correct carb

Mikuni VM30SS

ID # 44560

All the parts and specs are listed in the service manual you can get digitally on ebay (p. 105). I am looking for a rebuild kit, but it seems one would have to find bits and pieces here and there. I am awaiting to talk to the owner of vintage iron to see whether or not their 30mm plug and play carb is compatible. Goodluck to you sir or madame!

...Also see this...

http://www.advrider.com/forums/showthread.php?t=647090