Size list special tools
 

8mm, ratcheting wrench, glow plug nuts.

10mm triple square, cylinder head bolts.

14mm Allen, differential drain and fill plug.

16mm, bolts that mount the steering gearbox to the chassis.

21mm, wrench or socket, LOOP style glow plug main body.
FYI you can also use a 13/16 SAE wrench.

24mm, two open/box wrenches, idler arm, trailing arm.

24mm, open end wrench, ground thin for the engine oil cooler line NIPPLE = between engine oil cooler line nut and oil filter housing.
27mm, open end wrench, length must be cut for easier access of the engine oil cooler line NUT at the oil filter housing.

27mm deep socket, it must be cut full depth or have relief grooves for the diesel injector fuel return barbs = the wrong socket can break injector shells.
27mm short socket, some front crankshaft bolts are easier to maneuver/access with a short socket on a short extension.

36mm, fuel sender, steering gearbox Pitman arm nut, oil filter cover on some newer cars.
An SAE socket (1 7/16, I think) works well too

46mm, socket, fuel tank screen/pickup screen.
46mm + 41mm, open end wrenches, propeller shaft slip joint.

Flex disc bolts vary by what kit was used, and some are unusual.
The common HEX head bolt/nut sizes are: 19mm, 17mm, 15mm, very rarely I have found 16mm and 18mm installed.
The common Allen head bolt sizes are: 8mm and 10mm.