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A: I would say no, unless your current rollers are too long. It would be best to stick with the size of your current rollers.
A: You will need to measure and figure out if the 7 inch is not too short or comes off when your door opens and closed. Check the wear marks on the old roller and measure from the roller to the far end of the wear mark. If if it's less than 6 inches then you should be fine using the 7 inches.
A: You do not need to lubricate these rollers. The high-performance mobile grease grade XHP 222 grease in the bearing cage is protected in the 6200ZZ bearings by the sealed cap.
A: It is a great product for anyone to use in their garage door. Just be careful, and take all the time you need. In my case because the sectional garage door has 6 sections. I needed 14 to complete the job, so I ordered another set of the rollers, as they only come in sets of 10. My steel door is over 35 years old, and the original rollers were worn out. All doors sold today have 10 rollers or less. I highly recommend this product. JohnP
A: I believe this roller is sealed for life of roller,may have to check with manufacturer.
A: These rollers are already lubricated with high-performance Mobilgrease Grade XHP 222 grease in bearing cage that disperses periodically, so there is no need to lubricate these rollers.