I thought that kit also included H4 bulbs and reflectors to replace the original sealed beem bulbs?
I had replaced my sealed beam bulbs with hella reflectors and bulbs a while back:
Amazon product ASIN B0002M9QK6
And last month doing some other wiring saw a relay kit and decided to install it also, which would be pretty much plug and play, having a plug on it to mate with the original headlight bulb plug that it continued to use for switching the relays on / off:
Amazon product ASIN B07M6W1PMK
But, that OEM kit is probably actually cheaper and maybe better quality, the wiring probably would have been easier to just do from scratch rather than the hatchet job I did so that I could get the relays to mount in a box I installed:
https://www.amazon.com/gp/product/B07MR64XK1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
I also used other relays in it for some aftermarket fog lights I installed, and a new relay for the horn (which the PO left some random junk relay mounted to the apron side with a sheet metal screw...).