Have you contacted PrimeTime parts dept?
Without pics of which window you're asking about, kinda.hard to advise you.
Windows are not RV brand specific, so saying it's a 2018 Breeze isn't helpful.
I own a PT TracerAir, which was renamed the Breeze in 2018. We don't have many Breeze owners here.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package