My 21k mile MODTOP survivor came with T72 E70x14 Firestone wide oval white streaks
I'm thinking The fiberglass are the Goodyears?
First link you can see the never used original spare, 2nd link is window sticker showing T72.
I'll look into T74 more, i have a NOS set(4)of Goodyears, but i think they say polyglass on them? The white stripe would be the thin one like my spare.(same size as RED stripe)
http://www.mooresmopars.com/modtop29.htmlhttp://www.mooresmopars.com/images/jpg/modtop-on-ebay-original-window-sticker-modifieda.jpg