Don't think these tires have been mentioned before as a replacement for the 205/70 VR15 Michelin XWX
Pirelli P4000E 225/65WR15
on 6.5 inch wide rims they are 9" wide, 26.5' Diameter
(Summer Hi Performance tires.)
According to the data I have, the original XWX were 8.7"wide, 26.5 diameter on the same 6.5 rim width.
As close a size match as you are going to get I would say.
Have just ordered some - will know more later. They got good ratings in a comparison of Summer High Performance tires.
Replacement for XWX Tires 33GT 2HL
Replacement for XWX Tires 33GT 2HL
330 GT Series II sn 10069