Sorry, I was a little optimistic... As of right now, my parts suppliers price for the rails, oil tube repair kits, chain, tensioner and gaskets is approx £80, so about $140
The Febi tensioner is £30 and the chain is the same, which is where I got my £60 ($100) from. The oil tube repair kits are only £2 a side, and the rails are about the same each, again for Febi.

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i