Good find !
This looks like their web page maybe give them a call and see.
https://www.reliableaftermarketparts.com/
Edit:
The 1 review in the ebay ad mentioned the T.H.E. Company.
Looked that up and came up with this page showing a video of it working.
https://the-co.com/product/LEDFLASHER/
https://www.youtube.com/watch?time_continue=23&v=RXkaxJsiy4c