Advice asked for widthening rims on a 70 Duster

RPMagoo said
This is a 8" rim, with a 245/60-15" tire, on a 70 Duster (LBP - 8-3/4 rear). -- View attachment 1715470269 View attachment 1715470270

Cool, but that tyre size isnt available in 14". What would height 60 do on a 14" / 235? Compared to the front wheel which is 205/75/14?