This gets a little crazy with the different OLD FORD castings with rear window straps, there are 7 distinct castings, and they do not include the 1992 Roof Rail casting.

1990 Old Ford I, Rubber tires.
http://www.quicksilverdiecast.com/catalog/rcrbbr9be555.jpg
1991 Old Ford I, STP decal group.
http://www.quicksilverdiecast.com/catalog/rccr9eb66345.jpg
1991 Blue & White Old Ford II T-Bird rear window strap casting. STP fender decal group, White lettered Racing Champions Chrome cone wheels. Thin blue stripe & white body to top of rear window. BILL ELLIOTT Italics text name on roof, Outlined RED 9 on right headlight door. MELLING on rear fenders.
http://www.quicksilverdiecast.com/catalog/rc9bwelli.jpg
1991 Preproduction. Blue & White Old Ford II T-Bird rear window strap casting. STP fender decal group, White lettered Racing Champions Chrome cone wheels. THIN blue stripes. BILL ELLIOTT signature style text name on roof, Solid BLACK 9 on right headlight door.
http://www.quicksilverdiecast.com/catalog/9bethinred11.jpg
1991 Release. Blue & White Old Ford II T-Bird rear window strap casting. STP fender decal group, White lettered Racing Champions Chrome cone wheels. THICK blue stripes. BILL ELLIOTT signature style text name on roof, Solid BLUE 9 on right headlight door.
http://www.quicksilverdiecast.com/catalog/rc9bestp1.jpg
1991.5 Release. Blue & White Old Ford II T-Bird rear window strap casting. GOODY'S fender decal group, White lettered Racing Champions BLACK cone wheels. THICK blue stripes. BILL ELLIOTT signature style text name on roof, Solid BLUE 9 on right headlight door.
http://www.quicksilverdiecast.com/catalog/rcbw9er5.jpg
1991.5 Release. Blue & White Old Ford III T-Bird rear window strap casting. GOODY'S fender decal group, White lettered Racing Champions Chrome cone wheels. THICK blue stripes. BILL ELLIOTT signature style text name on roof, Solid BLUE 9 on right headlight door.
http://www.quicksilverdiecast.com/catalog/112edr5be9.jpg