Please forgive me if these questions have already been asked but i have been looking and can't seem to find the relevant threads!
I've brought 6x6 and found a few problems while trying to get it roadworthy...
They gave me a list of 11 things that need fixing and while think i can figure out most of the problems out I am having trouble with 2 of them at the moment...

Uni joints, one of joints in the double uni joint that goes to the third axle has play in one direction and i've looked through the rps manuals for the 6x6 but i can't seem to find the drive shaft drawings or what uni joints they use
One thread suggested K5-13XR uni joints for the 4x4, but i was wondering if the 6x6 is the same or different, and what the landrover part number is?

Windscreen wipers, the drivers side keeps on slipping (passenger side works fine), i've tryed replacing the conection between the shaft and the arm itself("spindle drum" i think it's called) on the outside but that didn't work and the sound seems to be coming from the inside so i pulled the inside vent off to have a look at it but nothing seems worn... My only guess is that the gear on the inside of the shaft which is ment to grab on the reciprocating spring is what might be slipping, and if so would trying to bend the cover down and force the spring and gear together help, or could it be something else?