I know the cable housing clips and the vertical metal pieces you cite. I don't recall this being a problem when I did those on my 108. You can detach the clips that hold the cable housing to those vertical pieces.

It seems like once you've done this and detached the wire from the heater valve cylinders and little steel plate, screw and lockwasher etc., that you can thread a screw into the hole in the cylinder and pull it straight out.

Is the cable housing to the right valve obstructing your removal of the left valve?

If so, detach the housing from the vertical bracket restraint. I can't recall if the clip mechanism restraining the housing is just a clip or if it has a screw holding the clip, but the clips do come off.