ok I am trying to get the right orientation when I am looking at that picture labeled (this Original).
It appears to be the drivers side (left). And the "side mount bosses" as you call them are the locations for the side motor mounts which the 57 does not use as it has front motor mounts like your 58. And those side mount ones are what made the banana style heat shields not fit.
so the double wire front loom is that one labeled double and mounts on the same hole as the heat shield on the block, Not on the oil pan?
The single looks to be on the oil pan area under the second spart plug from the back. Did it hold both wires going to the front? It looks wide enough to hold two. And then the left/rear two plug wires just dangled from the 4 wire holder at the rear (not shown) and went to the rear/rightmost plugs?
Did the rear plugs also use a 2 wire loom at the heat shield hole? I am trying to figure out why they seem to put 4 of them in the kits. Or is one for the location where the single is shown on the picture?
The (one here) picture shows the 4 wire loom to be even with the exhaust manifold so in the normal place not on the oil pan.
Here is a link
LikeThis1 to a picture I drew over to try to show what I think you are saying with the shields and looms/clips. Is this the right idea or am I still missing something? I tried to show the single loom at the bottom on oil pan and the double to the left on the heat shield and wires behind the down tube. And the oil pan would be below the horizonal red wires at the bottom. The single clip on the oil pan bolt.
Does that sound about right?