I'm looking for HT-KM KombiTool Pole pruner chain tensioner, I think mine is the old model with the orange cover not the 2011 onward one without the orange cover?

I have had a look for you and you can buy the following kit for the chain tensioner on the HT-KM machine - https://www.lsengineers.co.uk/catalog/product/view/id/10474 This kit just doesn't include the bumper strip which you may need on the pole pruner, please see the following link: https://www.lsengineers.co.uk/catalog/product/view/id/11133