[Fot] expansion tank needed

[davehogye]

Hello all, 
I'm installing an aluminum radiator in my TR3 that doesn't have the original style filler neck and I'd like to place an expansion/fill tank in the battery box area. I know that Spits, TR8s and MGBs use an expansion tank and this is the type of tank that I would prefer using. Does anyone by any chance have one of these style tanks available? 
Thanks, 
Dave H.