I have just had a look and found 2 part numbers, but I’m guessing there should be 3.
The first one is listed as 1983-1993. FRC2644 I think this one is the one the OP needs.
The second is listed as 1994 - 2006 NON ABS.
FRC7065 I’m guessing there should also be a part number for 1994 - 2006 ABS, but I don’t have time to look that one up.

If the swivel balls were the same for the railko bush and bearings, why does Land Rover list 2 part numbers for them?
Not sure, I only deal with Series these days. So it is quite possible you are right, and there are two types of balls.
On the other hand, it could be that the two part numbers are for kits with Teflon coated balls, and the ones with bare steel.

All I have ever done with these is take it all apart, and look at the parts that are actually there, and order what looked like the same.
As far as I can remember, there is a high degree of interchangeability with all the stuff on them.
 
Land Rover do make me laugh.

Series started with top bearings, but they were found to be rubbish, so they went over to Railko bushes, which were fitted for a long time, well into coil spring model production, and then they decided to go back to bearings.

Tottot said.
The first Land Rovers had a spring loaded cone in the top of the swivels of what looked like bronze. My 58 2 had them. I guess the idea was it automatically took up wear, problem was the steel splined rod from the steering arm to the bush would wear and slack would be in a place where the spring had no effect. Changed my 2's to Railko bush which was a straight swap and probably a cheaper part to make.
 

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