The flex disc bolts on front disc got worn out - it was clunking - and also the seal started to leak (which I believe was caused by the driveshaft wobbling) - Ive searched and found that I need a 30mm extra deep socket.. Firstly I have no idea where to buy it from.

Secondly when I unscrew the nut from the yoke - should I just rely on the parking pawl to counterhold it and does the yoke itself come out easily?