1999 S80 changing 2 front control arms

[Countryvolvo]

Hi I've got a 1999 S80 2.5 I've been looking at what needs doing for my mot next year and on the last mot adviseres was mild play in control arms but not expensive so I'm looking into doing myself where's best to gets parts and is after market parts ok if so what ones if not wheres best to get gen Volvo parts at good price and as I'm gonna be working in that area was thing of doing drop arms at same time just to keep her looked after