does anyone make a tank specific for a 801. I know a 801 will fit into any 510 carto tank. I want something specific for the 801. with a recess in the bottom for the bottom this slide into. so they could be somewhat flush mounted. some 510 tanks have specific bottom caps you can screw the carto into the bottom cap and then screw the cap onto the device. imagine the new z2 carto system but with a 801, then you screw into you 510 device