Got this “J” Channel from Amazon. BTW, it is 35-21/32” Not the Full 36” and hole position from end isn’t the same on each piece. Cuts easily with 12/32 hack saw blade.

Outwater Aluminum J Channel Fits Material 1/4 to 9/32 Inch Black Aluminum Cap Moulding with Holes 36 Inch Length (Pack of 4)


