You guys done yet? You never need to replace T4 flywheel bolts unless they're damaged in some way. The oil from a leaking rear main seal isn't gonna get on the clutch unless it's just pouring out. The F/W o-ring is a more common source of engine oil migrating to the clutch. However, in this case, it' looks like it may be tranny oil.
The flywheel is on its last legs. It's been cut far enough to require the heads of the F/W bolts to be cut down, and that means it can't be cut again (it probably shouldn't have been cut the last time!). If you leave it alone, maybe just break the glaze, it may be OK for a while. With the F/W cut as far as it has been, you need to make sure there's an extra washer behind the ball stud for the release arm. The washer to use is one of the ones under any of the tranny cover bolts. Put something else there in its place.
When removing the tranny, or the complete drive train, it's FAR easier to remove the 4 8mm bolts on the tranny mounts than it is to remove the 2 large bolts, and you'll never have to remember (or ask) where the washers go ..........
Now back to your regularly scheduled program ............
The Cap'n