Hi Terry,
Replacing the pads on an AL-KO 1300 stabiliser hitch is an easy job - you need the AL-KO pad kit - which has two small "C" clips that retain the pads.
Warning - these "C" clips are one-shot - they are destroyed when you remove them.
There are full instructions with the pad kit, also on the AL-KO web-site, and on caravan web-sites that use the AL-KO 1300 - like the smaller Eriba Touring caravans
Robert