did you check the dealer?
BlueBird has ones that fit the bigger, newer, buses, and they weren't too bad in price, with the BlueBird logo. Bet they'd fit older models, also They didn't fit my bus, though. Mine were discontinued. Not even a close fit.
If I remember, you don't have a Bluebird, but check the dealer anyways?
Look at the Sky; look at the River. Isn't it Good?