You need 15" rims. This measurement is taken at the location where the tire seats, not out at the edge. A 15" wheel will measure about 16" from edge to edge, 15" from bead to bead.
You need to look inside the drivers door jam. Open the drivers door, look below the latch assembly There will be a small sticker (white) that will tell you the cars tire size,example (P205-75 R15) Then , write that down. You can then call around for the brand & prices you want with out leaving the house! I hope this will help you out some Good Luck! =)