As this part did fix the majorly present issue with my fathers truck, I can only give it 4 stars because the STC replacement fitting that was preinstalled was installed incorrectly. I had to loosen the jam nut and turn the fitting back out 1 whole turn as the bolts wouldn't line up. Otherwise great service and shipping times.

The part arrived on time and it includes all the seals required for the installation. The truck now run great and the only reason I am giving at 4 is I haven't tested the truck under high load (towing) yet.
I give the service a 5 and I got my refund for the core very quickly. I am a returning customer and I think I will be one for a long time.