I installed a rod that is on hinges for our shower on our 2850 BH. It only took 10-15 minutes to install, and gave me 7" inches of more space at the top of the shower for our shoulders. I will attach a link from the bar I bought on Amazon. The opening for my shower is around 39 inches, and it has given us more room while showering so the curtain isn't constantly rubbing on your body and sliding open.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1