Mk1 original pump part number

Hello All ,

Got a real pig of problem, mk1 golf clipper 1.8, 90 Reg  keeps randomly cutting out, somtimes i get it to run for 2 hours , some days it stuggles, ive replaced the following, Fuel pump, distrbuter, spark plugs, filler neck, ht leads, rotar arm, ignition module, bypass the vapour seperater, block of the fuel return, also had 3 webbers fitted to completly rule out Carb issues
i want to drive it with confidence, was thinking about the aftermarket fuel pump, can i get a real close aftermarket performace fuel pump as good as the original Vw Fuel pump , can amyone help me

Have you checked the tank and fuel lines throughout.  Also the carb base.

Thank for getting back to me,
I had the fuel line air pressure out last week
It's had 4 Carburettor, on the same cab base plate,
It just broke down on Me😤
, getting close to selling up, as I can't locate the problem,  

Also is there a fix for the choke cable  as the hole it  sit in has broken out over time,
Just using a plastic plate, screwed onto the dash over the automatic choke  cable Hole