Replacement rollers
I'm afraid I can't make out your dimensions with 100% accuracy from these photos, but the design of your assembly matches our 81-030 closely. This may be what you want. Make sure to quickly review our measurements to verify that everything lines up; I'm chiefly concerned with height, width, and wheel diameter. Length is not that important for these parts.
That should be okay. This roller can be adjusted to help make up for minor differences in wheel diameter. In your case I don't think that will come into play all that much. As long as the other dimensions match then it should still install and function.
It looks like we have these in stock, so shipping time will depend on whatever delivery method you select during checkout. We offer a couple different options.
Thanks for considering us for your business, it means a lot. Please let me know if I can answer anything else.