haha must be my laptop speakers then.

i'd imagine the o-rings to be pretty cheap from ford to be honest so prob best to go to them.

the wandering sounds weird, as if it could be something else like tyre pressures, but then it could easily be the rack if thats past its best.

i don't think its that hard a job tbh just time consuming for a garage to do. easiest way to realign the subframe though is to reuse the original bolts in the same locations and jiggle it about so the dirt marks all line up. if they do need to be replaced you can then just wip them out and replace them one by one.

good luck, let us know how you get on. i'm still in two minds about where to source a rack, will prob get a recon one though as i will end up spending more money on a breaker one by fitting new track rods and ends.