Got the AC Delco 215/153 charcoal canister installed. Amazon delivered on a Sunday, ordered a couple hrs ago. Wtf. Amaze balls.
I used one of the existing clamp bracket to install.
I removed both clamp brackets from the upright pillar via the two flange nuts. Then left the lower clamp on the OE canister and put the upper clamp on the new one. Because of the larger diameter, you need to use a longer bolt in the clamp.
Note slotted head bolt, its approx a 3" x 5/16, (holy crap not metric) allowed me to get a stubby on it to fine tune angle and retighten, the nut is a wide square nut that didn't require a wrench, just spare hardware I had lying around. (you could use whatever you've got lying around too) Boom.
Due to clearance with the fuse box, you have install clamp on the cc first, then bend the pillar about 2mm out of the way (used vise grips to bend it) to get the two studs on the clamp back in their holes on the pillar.
(in retrospect, pulling the battery box would be the way i'd approach it next time. way more room, less faffing about trying to wedge it in there)
I cut one of my lines is a little short. So had to rotate unit to compensate.
Pic below: Old one with lower clamp still on it.