It's not due to size of rear brake cylinder. Braking is done for 80% by the front anyway. You need front pads with (alot) higher brake coefficient (mu-factor).
If he is happy with an aftermarket one:
https://www.historicmotorsport.net/shop/new-parts/accessories/mk2-escort-washer-bottle-pump/
https://www.ebay.co.uk/itm/316142155551
or a NOS (!) one on ebay:
https://www.ebay.co.uk/itm/256823532131
Here is a NOS Mk2 Escort item (also used on some other models, 76BG is a Cortina partno):
https://www.ebay.co.uk/itm/226262181868
I have a similar washerpump but it has a 79VB partno (Transit) and it has a black body.
On the left an original set, on the right my remanufacturing effort. With the nyloc-nut you can adjust for the thickness of the headlamp-tab as I found that not all are the same (Carello vs. Hella vs ...).
Hello,
is there a source for a fitting kit for a headlamp (EU style) to a plastic bowl as re-made by Magnum? Everywhere I look it's just the plastic bowl. If there isn't, would there be an interest in such a fitting kit?
Regards, Leon.