TBH mate 205/50/15 isnt ideal.

Thats quite slim and low profile, not suited for drag tyres that are made to crease on launch to get maximum traction (2ply sidewalls and only pumped upto 15psi max)

Your better off with as big a sidewall as poss, prob more important (for the above reasons) than how wide they are.

You care if they road legal or not? If not id just get some non road legal ones like MickeyT's etc.

If you do want ones of that profile then BFG drags (steet legal) are available in that size.

Higher profiles on smaller wheels (14s?) would be better tho.

Can get upto 275 wide on 15s of most makes.

DannyB off here (ie Huaser Racing) can get most types.