Info needed: Fuel pump rebuild.....what time is it? modern fuels

[Alex van de Wetering]

It's about time to rebuild my glass bowl AC fuel pump. I have recently bought a rebuild kit with a new "red" membrane, which is supposedly suitable for the modern day fuels.
However most rebuild kits have a membrane with a hole pattern that doesn't match my fuel pump.....in short, the 6 holes are at a different "time"....I am guessing AC changed this during production, or it's a slightly different model.
Any other members that have experienced this same problem???

I also noted that the plunjer in the centre of the membrane is a slightly different length. I plan to punch 6 extra holes in the new membrane in the correct location and modify the plunjer to match the original......unless anyone says that the extra holes is a no-go and a guarantee for fire?

Attached are some picture of my original black membrane and the red replacement. Also the base of my original fuel pump (left) and a spare on the right, that show the different hole patterns.

Alex