Looks like at some point after leaving the dealer someone replaced the early 99 AB injector with one of the "cackle cure" AD injectors that I think Ford was replacing for people to help try some of the cackle noise coming from the fuel starved back driver's injector. Mine is 3/98 build and still has all 8 AB injectors in it. I'm the second owner and apparently the previous owner didn't take it in for the replacement (which I'm more than ok with).
Lots of good shops/vendors out there to talk to about your injector needs, especially if your looking to keep things pretty close to stock with no special tuning. KT, Dp Tuners, Full Force, Swamps, etc. You can even get new Alliant ones for a pretty decent prices. Lots of options and different opinions but since you are wanting to pretty much stick to stock without any new tunes and such your choices will narrow down a lot quicker.
Lots of good shops/vendors out there to talk to about your injector needs, especially if your looking to keep things pretty close to stock with no special tuning. KT, Dp Tuners, Full Force, Swamps, etc. You can even get new Alliant ones for a pretty decent prices. Lots of options and different opinions but since you are wanting to pretty much stick to stock without any new tunes and such your choices will narrow down a lot quicker.