The AeroQuip P/N for the 16 x 1.5 to -6 AN adapter is FBM2608. There are some other o-ring adpters available that allow you to use other fittings but I'm having enough trouble keeping the 1-piece parts straight so I would go wth the 1-piece part.
72 Ontario Orange Coupe. 2001 LS1 - LS6 block & Intake, Thunder Racing Cam, Ported heads and Throttle Body, Meziere electric water pump, Hooker Shorty Headers, 2001 T56 6-speed trans, VB&P Street & Slalom suspension, Magnaflow exhaust, DeWitt's radiator, SPAL fan, C5 power seats, Borgeson steering conversion. Future mods: HydoBoost, floor mats.