Trying to find very small breather tank

[gmorris]

Has anyone seen a very small (3" diameter, 3" tall) breather tank anywhere? I need something to use for a rear axle vent that will just have a fitting on the bottom for an inlet and a filtered breather on the top. I don't have much room to mount and don't need much volume really. Everything I can find is at least 10" tall which just won't fit well anywhere.

I already have a Parson's/Norris breather tank for my fuel tank mounted in the trunk but it would be an ordeal to get another one in there now and would rather just go with something underneath for the axle.

May have to build one out of steel since I don't feel like buying a spool of al mig wire for one weld to modify a can.