At 45k OTC my V6 has just started to produce the same annoying knocks. I initally thought it was a Ball Joint, so I replaced it last week but the knocks are still present, despite the Joint that came off, having a bit of play in it.
Anyway, not taking any chances so, Ive bought new droplinks, front and rear, and another new BJ from Autosave components.
Front BJ - £18 inc vat
Front Drop Link - £16 inc vat
Rear Drop Link - £12 inc vat
Hopefully all the knocks and bangs will be cured after this lot is fitted. Thankfully, none of it is too hard to change so I dont have to fork out for labour.

geee its painful at times, trying to find where these annoying knocks come from
Edited : Got half way to work this morning, and my front caliper was "smokin" so have just had to replaced the front discs and pads too
Discs are from a jap company called "Blue Print" only £34 each..which appears to be much cheaper than the mazda originals at £84 each

Good old Autosave