Ken, If you're sure the noise is coming from the struts, then don't ignore that it might be them that are worn too - can't remember if it was this site or another where the strut itself had significant play evident once removed from the vehicle. The top mount can be difficult to diagnose, as far as I know the lower mount breaks up, but of course you can't see that until you drop the strut, the lower spring/pan mounting is easier to see though - the 'pan' is shaped to hold the spring and it's possible that the 'tail' of the spring moves out of place, only to relocate with a clonk - I think later models might have had a rubber 'seat' to overcome this. As you'll find, front end (and rear end) clonks, rattles and taps are a 'feature' of these cars and can take a huge amount of investigation before they're sorted!