Went ahead and did the rear valve cover as well. I had to disconnect fuel lines, move some spark plug wires, and disconnect a bracket by climbing up inside the hood, but overall not bad. Power steering pump hose was about a half inch above the cover so it was a bit difficult to maneuver. Overall, probably worth it. These bolts were quite a bit cleaner than the front ones, so I have a feeling it was fine (or in a lot better shape anyway) for the time being. Better to have it done and not have to worry about it though. I'll probably replace the grommets next time I stop in Autozone. I don't feel like they're urgent enough to run right away and get them, since they are external to the gasket. Thanks for the help. Going to go ahead and replace the drain pan gasket as well soon. Probably going to drive around for 50 miles or so to let anything that feel into the valves circulate, then change the oil and drain pan gasket.