For the bolts if it goes in OK and stops 1/4" from the bottom is strange. Normally threads go near the beginning. Check hole is clear (torch).
Any way try putting a spacer under bolt head< spare nut, so it holds short term. Do not over tighten.
I removed the 2 side spring plates and put a piece of soft rubber on the bottom slides.
Fits well now.
Factory code to enter hidden settings under "about" in menu is 3711
Need to then press save and turn off ignition until interior light goes out. Approx 2 minutes for settings to be saved.
I purchased this
direct from Erisn.
Plug and play. Comes with a loom for Bose too.