Technical Wishbone bushes, front?

[Ocwobio]

On my 05 Burstner Elegance i821,,,, i have been advised to keep an eye on the front wishbone trailing bush by ny MOT man. Not even at the advisory stage yet, but he says they are cheap and easy to change. Seen them on ebay, less than a tenner and up. Now, as this is a 5t tag axle, will the things be standard Duc items? I assume it is on the Maxi chassis. Does that differ from any other Duc 2.8JTD of the same year? (Have checked on ePer and there are 2 varieties of wishbone off the chassis number, is that significant? And can they be changed with everything else still in situ, or has the wishbone to come off? Thanks for the info people.