Hi Mike. None of the rollers are "standard" in that they don't fit all doors. It depends on the manufacturer of your door. I thought I'd try my luck and picked out one of the 12 different types I found at the store. I picked wrong! LOL I am heading back to the store today to exchange for the correct ones for my door. The only way to know for sure is to take the roller out of your door and take that to the store to compare. You can also try to compare it to the pictures online. Depending on the detail in the picture that may work and save you a trip to a store where it's not in stock. I realize my response is 2 years later but I hope it helps someone! As for being "easy" that depends. I think anyone who's pretty handy can tackle the project. I'm a girl and removed the 3 doors all by myself but removing the rollers was difficult for me. Because you pretty much have to take the frame off the glass and that is best tackled by two people. I asked a friend to help and he was able to figure it out even though he had never done it. I found some YouTube videos which were helpful. They helped me feel more comfortable about trying this on my own before paying a door specialist to come out here. In my area they can easily charge $150 a door vs. $12 for the rollers. And while I'm all for paying a professional to tackle the things that need it, if there's a DIY solution that doesn't require I be licensed, I'm willing to try it. Good luck!