@virginiaJim, sorry for the laborious response, but it’s impossible to discuss belt alignment with brevity. Yes, the adjusters are the same length (L and R both have the same part #). Adjusting an IM belt can be tedious, but gets easier each time you do it 😂🤣. IM could have certainly come up with a better system, that’s for sure. Don’t worry about getting the belt to stay in the center, that’ll only happen once in a blue moon.
It’s not uncommon for the belt to move from side to side as the belt wears. How finicky is the adjustment procedure? I spend a couple days determined to defeat the alignment process and get the belt to ride in the center. I’d make a micro adjustment, go for a ride, then come back and make another tweak. The belt was riding on the right side of the rear pulley and I moved the left adjuster about 1/64“. That was enough for the belt to move to the inside of the pulley. After a few days of riding, it was back on the right. 10k miles later, it’s back on the left. Lastly, the belt needs to be at room temperature before it’s adjusted. This is one problem when riding your bike to a dealer for an adjustment - it’s still hot and has contracted (Kevlar belts contract when hot, expand when cold).
As @Baron58 mentioned, the oval alignment indicators on the left and right need to both be oriented in the same direction (in order to accurately use the alignment indicator marks). The “front” of both oval pieces need to be oriented up as far as they’ll go in the recessed area. If you can’t visualize this, it’ll become clear once you start. After getting the belt aligned, I’d mark the adjusters with a bit of paint so you have a starting point the next time. Good luck.
It’s not uncommon for the belt to move from side to side as the belt wears. How finicky is the adjustment procedure? I spend a couple days determined to defeat the alignment process and get the belt to ride in the center. I’d make a micro adjustment, go for a ride, then come back and make another tweak. The belt was riding on the right side of the rear pulley and I moved the left adjuster about 1/64“. That was enough for the belt to move to the inside of the pulley. After a few days of riding, it was back on the right. 10k miles later, it’s back on the left. Lastly, the belt needs to be at room temperature before it’s adjusted. This is one problem when riding your bike to a dealer for an adjustment - it’s still hot and has contracted (Kevlar belts contract when hot, expand when cold).
As @Baron58 mentioned, the oval alignment indicators on the left and right need to both be oriented in the same direction (in order to accurately use the alignment indicator marks). The “front” of both oval pieces need to be oriented up as far as they’ll go in the recessed area. If you can’t visualize this, it’ll become clear once you start. After getting the belt aligned, I’d mark the adjusters with a bit of paint so you have a starting point the next time. Good luck.