This will fit in the E1705 with no modding necessary! I recently bought the M1710 Palmrest for my E1705 and didn't like the XPS in the middle of the touchpad. The LED does NOT work as far as I know on the E1705. It will however work on an M1710. Here is a pic:
My price is $30 shipped. If you have any questions, just PM me, I'm on here daily. Thanks!