Easy peasy lemon squeeezy mate
Weighted shift rod is most easy, remove 2 split pins, take off old unweighted rod and fit weighted rod & split pins. (You could have got one much cheaper from a rod change MK3 Golf but you probably don't want to hear that
)
The short shift is a little more tricky but still easy, look in the engine bay for the relay shaft, its the bit with the big rubber ball on it
Bolted to that is the bit you need to look at, the next step depends on the design of the short shift.
If it replaces the whole arm undo the top nut and it will pop off. Then fit the replacement and do the bolt back up again.
If its the bolt on type, just bolt it to the original arm.
