Record the smallest of the 3 measurements and use the number as the height when ordering. The overlap recommended is to allow appropriate coverage and avoid any light gaps. Shipping cost & price difference 1pcs is 1USD on... INSIDE MOUNT MEASUREMENT: Step 1. Measure the inside frame width at 3 locations-top, middle, and bottom. ② It is used to for customer to pay extra charge caused by the changes on the shade size, shade pattern, additional swatches or something else. Burnt Orange Silk Pendant Shade with Mairi Helena Mirrored Storm Linen – Cotterell & Co Roman Shades For Windows Blackout Moden Shade Xpess | Shop & Ship Easy-DIY Custom Shades Outside Mount Roman Shades ③ We will proceed the original order as customer required once get the extra charge. yihua 948. The YIHUA 948DB II digital soldering station uses a rapid heating soldering tip, and is able to heat to 660°F in just 5 seconds OUTSIDE MOUNT MEASUREMENT: Step 1. Measure the outside frame width adding 3-10inch to be the outside mount width. Step 2. Measure the outside frame height adding 5-10inch to be the outside mount height.