These are listed and show WELCO DP-1836LQ compatibility in the description...

https://www.newegg.com/black-suppliesmax-04-1094-848/p/35S-00JZ-00282

https://www.amazon.com/AIM-Compatible-Replacement-DU-1170-04-1094-848/dp/B00JGVBHG0

I have zero idea if they will work. Maybe search for the other printer models in these listing's descriptions for a more common brand and start narrowing it down for better results, looks like they all use the same size/type...good luck.