The £60 or so is for a poly part to replace your rubber part only, they are also available from SUPERFLEX, they are made from poly-urea normally rather than the more common poly urathane.
I did away with mine altogether, buy tig welding a 4wd solid joint in place of it, but these type of solid joints can be got new as group 4 joints from
www.carbuildersolutions.co.uk starting from around £15, no need to worry about it after that.
tabetha