Yes the bottom ball joint holes needs reaming out to take the maxi ball joint. Axminster tools do the reamer for less than £10. Not sure about using FWD Astra uprights as it might be more trouble than it's worth moding them to remove the CV cup from the drive flange? MX5 uprights are very simular to Cortina uprights and the Maxi ball joint is a direct fit. How ever you still need to ream the top holes to take the transit drag link, so you still need to ream them but save the cost of the mushrooms and their lighter.
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