Roller Assembly Replacement

81-004 doesn't seem to match. This roller is 1 3/16 tall, the screw hole on top is about 1 1/8 from wheel end to first edge of the screw hole and about 1 3/8 from the other end to that first edge of the hole. The length is about 2 11/16.the width is about 11/16. I'm not sure which measurements are not relevant. I'm imagining the screw hole distance and the width and the height are most important. These measurements are give or take a 1/16. Please help and let me know if you still recommend the part above. The wheel diameter is 1 1/4.

Follow-up question to the one I just posted:
Is there a replacement with the tandem option and should I consider that option? My sliders are 4 ft, total 8 ft door. They are old (circa mid-80s) and heavy.