I phoned both GasGas main dealers here in the U.K. and they said that since KTM took over the kit comes without the pin. John Lee motorcycles had one left ( MT280218009 ) so I bought that one. The reason for change was a corroded pump drive shaft but the old pin was a very tight interference fit and I thought a new one was a better option than trying to reuse the old pin although it did come out with a bit of heat and not so gentle persuasion !