8' patio door

Hello,

Take a look at the 81-056 roller, which I believe could be the roller you are looking for. Review the dimensions to see how they match up to yours. Also, note that this roller can be supplied with a 1" diameter wheel. Thank you!

Our roller does not have the same guide bumps as your original roller but it does have the bottom flare, which can be pulled out with needlenose pliers for more projection. This will serve a similar function to stabilize the roller in the door. 

Looking at the 81-174, I think you could be right. It has the bumps and the flare at the bottom. What threw me off was the screw hole at the back of the housing was an open type whereas yours has a closed screw hole. However, that should not prevent the 81-174 from working for you.