Ford went to metric wheels in '98. F250 and F350 wheels made before that will fit. It has been posted that the E series vans continued using those wheels for some time after '98 but I can't confirm that.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.