Hi Stephen,
These dimensions are measured along the surface of the tank.
Front Section Pinstripe;
Top Line Left Hand Side = 11 1/16"
Bottom Line Left Hand Side = 10 1/16"
Top Line Right Hand Side (refinished?) = 11 1/4"
Bottom Line Right Hand Side (Refinished?) = 10 1/4"
Front Section Blue Block
Top Left Hand Side = 9 3/4"
Bottom Left Hand Side (refinished?) = 9 1/8"
Top Right Hand Side (refinished?) = 9 7/8"
Bottom Right Hand Side (Refinished?) = 9 1/4"
I thought I had given you enough info to work out the front section, but maybe not? As the sloping front vertical pinstripe is parallel to the front edge, or "bow" of the tank I thought that would be a good guide and allow for manufacturing differences in the tanks. i.e. lining the vertical pinstripe of the rear section up with the front edge of the fuel filler and then setting the front sloping pinstripe parallel with the front of the tank 0.6" away and fill in the rest?.
I'm not quite sure which vertical line you are referring to, but if you take the vertical pinstripe of the front section,then the distance to the "prow" of the front of the tank is 11 3/4" on left hand side and 12" on the right hand side. This is difficult to measure accurately due to the curvature of the tank and the radius on the prow. I measured it along the surface of the tank.
I hope this helps you out, if you need any more dimensions or clarifications please let me know.
Cheers
Ian