ledlightexpert.com is offering Tenon Adapter for 5 inch Round Pole - Light Pole Adapter for Slip Fit at affordable price.

Product Feature 1:-HEAVY DUTY Heavy duty steel design with double strength welds ensure the bracket lasts the test of time. Protective paint ensures finish.
LARGE INDUSTRIAL SIZE - Built to stand up to decades of us. (4 bolts are included. May not be applicable to all installs. Some hardware may need to be purchased)
SLIP FIT CONVENIENCE - Designed to fit any of our slip fit parking lot lights. By going with slip fit mounts you have full adjustability. Side to side and up and down adjustments.

Product Price:- $61.99

https://www.ledlightexpert.com/Tenon-Adapter-for-5-inch-Round-Pole--Light-Pole-Adapter-for-Slip-Fit-_p_2235.html