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Clutch- will most likely me a pressure plate fault. Probably lost its tension with the way it was used prior to you putchasing it. You may find the clutch plate wont look to bad.
Coil spacers/insulators- you can get these for both top and bottom. The bottom ones are only thin as the coil is retained differently to the top. You dont want anymore than maybe 10mm on the bottom of the coil. Placing one at the bottom is more for noise reduction. Factory they only come with insulators on the top of the coil.
Gearbox- that oil looks like it hasnt been changed in quite some time. It will unlikely effect the rollover noise.