Funnily enough, i fitted some 'Mk3' springs to my mrs' TDi earlier this year and the bit labelled 26 in the diagram was too small and it worked loose and fell into the spring coil. Last night, i stripped them down and used some Mk2 spring 'caps', (the bit the top of the coil sits on), and rubber tops. these bolted straight in. I used the extreme top part from the Mk3, (labelled 23), and it all went together fine. Hope that helps, if you can understand my terms!!!!