Hello. Been in touch with Hagon about replacing the rear shocks on my Commander Hagon Nitros - they claim they've never made/supplied Nitros for the Thunderbird. I'm pretty sure I've read on various Forums about members with Commanders who have Nitros fitted, so if you're one of them , it would great if you could post here- - The type of nitro - normal or piggyback - Approximately when you ordered them (And if possible, what spring strength you ordered and the units length) Cheers