Hello Manu Mach1,
If you want to perform an effective repair and be done with it, use the square Ford service roller. I can tell you from first-hand experience that when Ford first released this roller, the shop techs resisted using them with a passion. Rollers were supposed to be .........well, round. The engineers knew what they were doing when designing this square "Roller." The original round rollers would develop enough wear over time and wobble enough in the track to bind or break. The last service round rollers (D5AZ-A) were replaced in '76 by the D6AZ-5323240-A square version. Once the shop techs realized these actually worked and eliminated comebacks, they were okay with this new fangled thing. Drill out the riveted original and use the new roller and nut. I would also suggest a lube that David (Carolina_Mountain_Mustang) has recommended. Unlike the original lubes that dried out over time and had the consistency of dried mud, the Lucus Red and Tacky#2 does not dry out. It does well in the different temperatures and conditions that this hardware is subjected to.
The illustrations show the last round roller (D5AZ) and the D1ZZ-6523288-E bracket with the better fitting D6AZ-A square roller in the track. Just put the square peg in the square hole, lube it up, and ride!! :biggrin:
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