I had no problem fitting these casters to my Roomba 980. They worked great for the first week - pulling out a lot more than my worn out reels. However, after about 2 weeks I noticed a diminishing effect and after 3 weeks the rollers were noticeably worn. My previous rollers lasted at least 3 months before showing so much wear. Although the price is pretty good, be prepared to replace them more often. Update - I replaced the prematurely worn out bars with a second set and can see why there are so many complaints. I can't run it for 5 minutes without getting error message 2. I delete the message, it runs another 5 minutes and then stops again. I would definitely avoid that. descent to a star.
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