quick ball joint question

hi guys my brother has an e30 318is and the steering was pulling like mad and my mate diagnosed it was a ball joint that was gone! my brother went to motor factors and asked for a ball joint for e30 318 they said theres 3 types one for wheel one for chasis and 1 for something else my bro cant remember the name!
but just wana confirm is it the wheel ball joint that he needs to order?
 
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