These are the best upper rear arms on the market and these will be the main failure points, purposely redesigned to improve quality.
Couple of hours per side to fit. not too bad a job as long as you respect the inner bolts have captive nuts and need to be slowly and repeatedly eased back and forth to remove the bolts without the nuts breaking free.
https://www.dmgrs.co.uk/products/com...37476407672995