Hi, new here, sorry if this is in the wrong place, wasn't sure if this would be classified as a tech or non-tech topic/issue. Anyway, I recently decided to do a 4th gen bumper swap on my truck. Just for a little context, it's a 1999, 1500, 5.2L V8, automatic, single cab, short bed. I bought an OE 4th gen bumper off Amazon (Thank god for free shipping), along with the Overkill Fabrication conversion brackets, both the main ones, as well as the lower support ones. Sadly, it wasn't until now that I realized two things: 1. I need the original 4th gen hardware to hook it up to the conversion brackets, and 2. I bought a replacement bumper, meaning no extra hardware. Which brackets/hardware exactly do I need to get, and where can I get them? Looking at moparonlineparts.com, the diagram for the parts of the bumper are different to the diagram of the parts for the bumper on overkillfabrication.com, and I don't want to buy any brackets I don't need, or are just straight up wrong, thus, I came here. Any help would be appreciated! Thanks in advance!

Links:
Mopar Online Parts Bumper Link
Overkill Fabrication 2nd Gen Bumper Conversion Brackets
Overkill Fabrication 2nd Gen Bumper Conversion Lower Supports