You have a couple of options. The tank Mr. Funfer2 offers is probably the most economical. I know ERA sells an upgraded tank, which is constructed (so Peter tells me) of a heavier grade material. If you are looking for an aluminum tank, I have a Dove unit sitting on the shelf which might be of interest to you. It has the externally-adjustable baloney-slice valve in the inlet neck which allows you to tune the flow through the cooling system. It's been modified to match the Cobra hose configuration (hose to upper radiator on driver's side). Note here: it won't fit if you have the "standard" remote
oil filter which places the
oil filter just to the driver's side outboard of the expansion tank, as the hose outlet was placed too far aft. If you don't have the remote
oil filter, it should work fine. If you're interested, drop me an e-mail.