I only have the same as you have above as far as the schematics go, I do have the same erea for the 5A engine,
All very interesting Unki and I would also like to know of the different part # for the series 1,2&3 and if they even change, another interesting thing is the Romoto 1 & 2, Automatic and your 3rd scan all list the same part# for the plug spanner, #8-200 but in your second scan it shows the bent bar spanner for the toe ring as previously discussed, still a lot of grey areas will need to be cross referenced before we can put this one to bed I feel.
before we move to far away from the Fuel caps I have some images that I will put up because I have two that are green plasic but look to me to have original paint on them, firstly I thought I will show everyone what the clear/white cap looks like without paint.
this is it when painted and looking on the inside, as all can tell matches perfectly with the image Unki put up.
next are the only other green caps I have and they are all green plastic, one plain and two painted, the one on the left came off my outboard engine #131049, the one in the centre off Model 4 engine #125166 and the one on the right was not on a mower.