Hi there, owner of a 1.6 zetec 55 plate focus and looking at replacing drivers side ball joint. Been told best just to replace the whole arm rather than just the ball joint itself. Looking online I see 2 options one with a 18mm ball pin or 21mm ball pin. Do anyone know which 1 my car would have?

All help is greatly appreciated thanks.

On that car it's likely to be 18mm.  It's a bit of a lottery though so best to either double check first, or order both sizes and return the wrong one after.

Thanks man, that's what I was thinking, just don't fancy stripping it to check seeing as I do 40miles a day commuting to work don't want to ruin a bolt and left stuck lol, there is that option to I suppose lol 

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a good motor factors will tell you the right one if you give them your reg 🙂

As Tom said, buy both just in case and return the one you don't use. Might be worth checking if there is a re-stocking fee first though.🙂

I've yet to come across 18mm ones lol. Done plenty of them too

1 hour ago, WES180 said:

As Tom said, buy both just in case and return the one you don't use. Might be worth checking if there is a re-stocking fee first though.🙂

If you return it unopened etc. within 14 days then you're entitled to a full refund no matter what.