Is your crown a full japan build or was it AMI ( Australian Motor Industries ) If AMI then the rims would have been made in Aus by ROH size as stated by Hiro. when I changed from crossply to radials the tyre size was 175R14. However I later went for 185 R14 75. I have had several crowns over the years MS55,s & a few MS65,s but now I only have my original 71 MS55 left got too expensive for rego & insurance for the rest.