Hi Pinto, just measured mine, Abbey Spectrum 535.
Front Small Window , left and right: 22" W x 36" L
Front Centre Window 46" W x 36" L
Side Near Door Window 46" W x 24" L
Side Near Fridge Window 46" W x 24" L
Back Long Window 22" W x 41" L
Back Short Window 22" W x 36" L
Pleased to help. Liam