I'm currently doing the same to my 2018 SX 250. Just using parts from a 21 Gasgas 450 to find out what I need to order. It's important to notice, that you have to remove the two rubber grommets that the tank sits on, in order to fit the new tank. As mentioned before you need a tank, seat, subframe, airbox and silencer. But in order to make it fit, you also need the new battery and cdi holder, ktm part# 79111055000
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