The short answer, YES! We developed our single stroller rain cover to fit both of our current single stroller models, the XL1 and XLC. We sell them separately just to avoid confusion, but also so we can track inventory and sales respectively to each model.
Sometimes our warehouse will label an XLC Rain Cover as XL1 and Sometimes an XL1 Rain Cover as XLC. Don't worry, it's the same item regardless.
To get the proper fit in either case, make sure to remove the parent cup holder if applicable.
Then route the handlebar through the top opening of the rain cover.
Then, route the plastic fold locking latch through the cover in the specified are on the side of the handlebar if applicable.
Then, route the cup holder attachment knob through the other side of the rain cover on the other side of the handlebar and re-attach the parent cup holder if applicable. This allows the rain cover to lower and sit down on the top of the stroller properly.
Lastly, use the velcro attachments at the bottom of the rain cover to securely attach it to the top of the front wheel housings if desired.