Skymac:
My friend has the delux combo from Dreamworks and they are a pain to install. The retracts are a lot bigger than the stock restracts and you will need to do a lot of wood grinding and even cutting (You have to cut the main retracts and drill new holes). I recommend buying the straight legged struts that use the 6 mm pins. That way you can use the stock retracts and still have trailing links. This is what I did but I also replaced the stock 6mm with harder steel 6mm pins; or you can drill out the holes for 8mm as some have done.