Naj is probably right, but regarding the rubber cable boots, they may be pretty easy to replace. The electrical connector blocks come apart pretty easily; just pop the top off, and all of the wire ends can be pulled out. Make a diagram of their order, but really it would be hard to mix them up. I'd think you can finagle them through the holes pretty easily, although I can't say I've actually done it. Make very sure nothing is on! Good luck!
George Davis
'69 280 SL Euro manual