Post #9
The bolt is longer on the 137 setup. This is because the tensioner bolts directly to the block whereas on the 136 setup there is a hollow head stud that screws into the block and passes through the tensioner, and then a short bolt that secures the tensioner to the stud.
Going from 136 to 137 you need to remove the stud (hex socket in the hollow) and replace with a 55mm M8 bolt (Peugeot #6922 31). The 137 setup also requires an additional stud added to secure the static portion of the spring loading mechanism. I believe they used an exhaust manifold stud in the factory, but pretty much any M8 stud / fastener can be used as long as it gives about 10mm protrusion from the block.
If you're going the other way, from 137 to 136, then you need the hollow head stud, part number 0820 17, which includes the shorter tensioner bolt.
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Rich