Hi John. I replied on the other thread, but I'll put it here too. Standard shocks on a '77 CR250/CR390 are Gas Girlings, that are 380mm long with around 140mm shaft travel. I think that I measured the travel on mine with the springs off the shocks and it came to around 9 inches, depending on where the axle position was. I ended up putting a set of 383mm remote reservoir Ohlins, that came off a '79 Husky 390 Auto on my CR390, because the shafts on the standard Girlings had rust pits in them.