The top bar on pleated nighttime shades typically extends about 1/4" to 1/2" (0.25" to 0.5") beyond the fabric on each side, making the total headrail width approximately 1/2" to 1" wider than the fabric width. This extra width accommodates mounting brackets and ensures smooth shade operation. The shades mount to the top bar from the back. If your fabric width is 38", expect the total top bar width including brackets to be no wider than 39", which is important when installing shades close together, such as with a 2" gap between windows. Regarding expedited shipping, the $49 fee applies per order, not per shade, regardless of the quantity ordered. For precise fit and installation, specify your fabric width when ordering and mention any tight clearances. If you require confirmation on a specific model or additional details, contacting Elkhart RV Parts directly is recommended.