does remanufactured mean it's used parts that they spruce up and put back into a package? or does it mean it's some guy copying the original OEM part but using "similar" materials and recreating it.

^ That’s where your core returns go

I bought reman'd calipers one time and had to reman'd them myself after it started leaking after the first drive.

And then I reman'd my original calipers because the reman'd reman'd calipers were spongy.

injectors are a funny cat, I got lucky and replaced my lucas injectors (they were 100 each new) with bosch fox body mustang injectors and it worked