For information. Following on from my request for information on which alko shock absorbers to fit my aging 2005 Tritin 430 GT as the octagon red/green/blue type DO NOT, fit my mobile servicing technicians, KIWI LEISURE (Ripley, Nr Harrogate), sorted out the problem. They got their supplier to contact alko for the correct parts number. This info arrived within 10 days and the last pair of this type of shock absorbers in the country, at the time, were aquired and fitted, by Chris from Kiwi Leisure, on Saturday morning, in the pouring rain, so that I could go on holiday last Sunday. Brilliant service. He tells me the part number is K2 282259 (ALKO). They seem to work very well, hardly any squeaking and good mpg towing.