Could be several; I found nothing in my listings with those numbers on them. Could be Toyota 13.5 lb/hr or they could be 18 lb/hr, or whatever. Honestly, you really have limited options. Without knowing what they are, you "could" send them off for flow testing/cleaning. Then you'll know. I just went through this and sent mine out for inspection; one came in nearly dead and the others were all over the place (also purchased on the used market). The cost to flow/clean/repair them was about $70 less than a new set of siemens-deka 80lb injectors, and they'd still be old/used injectors. So I just replaced them with a new set of siemens-deka 80 lb.