Hey all, got the brackets from the original seller and finally had the time to put the cover on and get it painted. I was originally planning on doing a much more thorough write up with more pics, but kept forgetting through out. Anyways:
Some parts I obtained:
The rear threaded inserts had to be added. OEM-wise, they use rivnuts (m6 if i remember correctly). You can obtain these at any part stores, but I went ahead and got the original parts: PN 6504710 ( 2 of these). You can make a tool, get a specialized tool, or buy a simple tool at auto parts store to install these (see pic).
To remove the spoiler off the bed cover for painting, you have to remove some plastic trim clips. I just found some generic ones on Amazon to put it back on (see pic).
I think this cover had the original struts, one of the clips had broken off, and the other one loose, so decided to replace both. These seemed to work and was easier then finding a correct size strut. I took the ring clips off these:
https://www.amazon.com/dp/B0CQD8V7D2?ref=ppx_yo2ov_dt_b_fed_asin_title
(1) The spoiler just has 2 nuts you have to unscrew, then slide it back, then 2 more bolts you have to undo.
(2) I was originally wanting to get the bottom painted same as the body to match OEM specs, but since the rubber insulation was a bit tired, just decided it was more effort then it was worth, maybe some day. It had a couple scrapes on it, but black trim spray paint took care of that.
(3) Here are the brackets I was missing. I didn't worry about painting these as you can't see them when they are on other side of the bed.
(4) I just followed the measurements in the stock instructions for the front holes. They were a bit bigger then probably needed ... I just grabbed a couple bolts and nuts with washers for the side bolts. The instructions call for self tapping screws, but I was able to get a wrench back there.