Most people don't tear down and blueprint them, they just take them out of the box and stick them on. Never assume they are good to go or correctly spec'd without verifying. All of them we used needed to be tweaked from the gears being too deep in the pump body to the surface where the cover plate bolts on being a source of a pressure leak.
Might not be a bad idea to cut your oil filter open and check it out too as a precaution.
