I found 45" sheers at Penney's (and they also have 54"):
http://www.jcpenney.com/window/shop-...TFXT-Nmqv3hz_-
RoCIxHw_wcB&matchtype=b&utm_campaign=paid+search&utm_medium=cpc&utm_source=google&id=cat100260226&deptId=dept20000011
Here's a 45" on Amazon:
http://www.amazon.com/Stylemaster-El...dp/B003VZABSC/
The above are all curtains with a rod just at the top. If you are looking for rods at top and bottom, I found these. Some are 45" and some are 50".
https://www.countrycurtains.com/cate...ider+panels.do