The Bosch VE type Fuel Injection Pump on my Volvo Diesel developed a leak. I traced the leak to a large Plug in the center of the head of the Pump. That plug is setup for a triangular with rounded corners socket; meaning it has 3 flat sides on it.
In the past I had across this same issue on the smaller side Screws but was able to make a tool for that.

My first thought was to buy one of those Gator Grip Sockets at around $30 for the large one but I believed the OD was not going to fit.

I decided to see if a socket was available and found a whole socket Kit for less then $30 (that price includes the shipping from England).

The kit has Bergen Item No. 5850 on it and I could find no country where it was made on it. You get 5 special sockets in the set. 4 sockets are the 3 flats type and one is what I call a gland nut socket with 2 flats.

The larger ones are 1/2" drive and the smaller ones 3/8" Drive.

Older VW Diesels and my Volvo Diesel from the 1980s use VE Pumps and I believe some Cummins, Newer Vws and even some Mercedes use them.
Note there is some tear down and assembly instructions on the internet for Bosch VE Fuel Injection Pumps.

The Fuel leak turned out to be caused by a hardened and cracked O-ring. I got the replacement O-ring at a local hardware store.

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84 300D, 82 Volvo 244Gl Diesel

Here's one for the Bosch VE pump used by Volkswagen. Is it the same thing?

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1998 E300 turbodiesel

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One of the sockets in the set should be the same but I cannot get a idea as to what size the one pictured is and the description is not specicific; "Triangle-shaped socket for TDIŽ diesel pump internal repairs".

The set is not for anything with a common rail system on it.
Here is a pic of one of my Pumps. there is a socket for the bolt on the side (the Governor arm pivots on those screws inside of the pump) and the large pump in front of the plug.
The Soket with 2 flats fitse the Fuel Pressure Relief Valve which is at the top rear of the Fuel Injecton Pump.

The pics are of my Volvo Diesel but the 1980s VW Rabbit pumps are the same.

I don't know what the other 2 sockets are for.

I did not find this helpful but this is the is the info from the Ad.

Product information
5 Piece 1/2" drive socket set for Bosch pumps.
Contents:
1. 7MM - EDC pump cover socket from 1996 to 2003.
2. 12.6MM - Bosch VE Diesel pump socket used on VAG systems Bosch Distributor injection pumps each with 1/2" square drive.
3. Triangular nut to loosen cover screw
4. Triangular not to loosen cover from the dial gauge.
5. Two lock nuts for the pressure control valve to VP37 pumps

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84 300D, 82 Volvo 244Gl Diesel

Keep in mind this is a set of 5 sockets and not just one socket.

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84 300D, 82 Volvo 244Gl Diesel