'One-Shot' to grease nipples

[GlennBurnage]

I'm thinking of removing the One-Shot system - it leaks badly from the ends of the steering rack until it has emptied the tank. On my car, it only feeds the s/rack and the inner wishbone pivots. I would like to use grease nipples and then use a slightly heavier grade of oil. Not sure what the threads are and if g/nipples of the same threads are availible.
Any thoughts, that are helpful, would be well received