Dear I do not know about shops in Multan or Peshawar, however, in Rawalpindi, I can suggest to visit Kamran market in Saddar.
There are some shops there (you'll have to visit them to see for yourself), like Mehran Autos, which might have the rims with them. Still, regarding their availability and pricing, I cannot confirm.
1st visit the market, and then this shop, to see and check for yourself.