Same here. It's a PITA to shove down the last 25% of the way haha. But I literally never use my radio, so there's no point. I should pull it out, proper.yeah my antenna is shoved down inside, didn't both taking it off when i put on my block off plate lol.
As for the bolts, I think go OEM replacement also. Just giving the bay a good scrubbing is a real dress up. Check out the results from mine today (not a DOHC, but all stock dirty to clean.) Pull out rusted bolts and put some anti-seize on new ones. Sand rust of old brackets or replace them. Will help the bay look damn clean.
I'm liking those rims the more I see them. Nice progress for sure.