If you need to intall two LED shoebox fixtures with slip fitter bracket on one light pole, you need a buy this bullhorn adapter.
Usage guide for the bullhorn adapter
Top two tenons: fit 2-3/8″ slipfit fixtures
Bottom diameter: top mount to fit 3″ round pole
Finish color: dark bronze
You can also use another cheaper bullhorn bracket, the same function.
For more light pole adapter accessory, pls check the catalog here.