Will the Fox Replacement to ANH fix the sync problems ?
 

Just rented ANH and although I enjoyed it greatly and never noticed most of the problems people are moaning about on here, I did notice the audio was quite out of snyc in places.

Will the replacements fix this or is it just to fix the skipping (which strangely I never experienced until the last 30 secs of the film :) )

No, only skipping on many players. And yours doesn't sound like it's having the problems that they are fixing.

No.