I run 245s on 16X8 phone dials and I'm pretty happy. 245 is as wide you can fit in the 8 inch wheels. I doubt that 245s will fit correctly in the 7 inch ones but I might be wrong. If you're budget minded, phone dials are an excellent choice. They are strong, plentiful and cheap. In case you're not aware, a great source for Porsche information and parts is Rennlist. I bet that if you place a posting in the 944 forum that you're looking for phone dials you'll get several responses.