Thanks for the reply dojj, i think that's the approach I'm going to take. Cut the tie rods down on the new rack and just get extensions that I know will give me the total length I need to fit for the wider track. Can only seem to find extensions no smaller than 50mm each side meaning with those fitted it will make the tie rods too long. Trying to avoid the original approach of just welding threaded bar to the tie rods using a larger collar which then means you can't change the gaitors!