What prostar rims do I have/need

Hi,
I don't understand rim sizes.. So..
I have a set of 4 Prostar rims with BFG 325x50xR15 T/A DR's on the back. Really like the way they look on the car and grab at the track. . Since these Dr's are not good for all round driving (great at the track). I was thinking of getting another set of matching rims for the back to mount Nitto or G-forces on for street driving. Then I would just change the backs for the track.
If I bought Nitto 555's (205/45 ZR16) or BFG g-force (205x50ZRx15) what size rims should I get. I like the way the T/A radials fill out the wheel wells So would like close to the same size tire. There are some on ebay.
http://cgi.ebay.com/ebaymotors/ws/e...ry=43955&item=2476277402&rd=1&ssPageName=WDVW


Help
Steve

85GTlover said:

325 and 205 tires are way different in width my man the 205 will not look the same at all, as for rim width 8" is pretty good to fit most. Even the sidewall width varies on your two choices by over an inch compared to the 325's.

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I looked on the BFG and Nitto sites and these seemed the closest to what I have?? Do you have any suggestions??