David as Andy says above here is the kit below.
https://www.ebay.co.uk/itm/Cylinder-...oAAOSwkXdd8zgP
Is your car running rough etc which is why you think you need to look at injectors ?
Connect the tubes and bottle to the injectors, block off the original leak back hose, then start car for 1-2 minutes and check how slow or quick the bottles fill up and to what ml
1
block the original leak back hose.
2
Stand the tubes upright or hang them.
3
4
You can see one as more in than the others but not enough to worry about really unless the car is/was playing up.
5
Brass connectors are always a good buy to no worry of the plastic connectors gong brittle and snapping off.
https://www.ebay.co.uk/itm/173091164085