Well, from what I've read about the picco revo mount is that it sucks. Not adjustable and weak.
I know when I was hunting for a BB mount for my revo, I found this one for the 21 or 26 picco:
http://www.neweramodels.com/item.cgi?session_id=&part_id=2285
It's also adjustable like the stock mount, so you may want to go that route instead.
That said, it seems that the 21 and 26 use the same mount. I checked OFNA's site and you can find the black mount that appeared to come with the 21 maxx, but on towers site for the 26 maxx, they link you to a grey mount. On OFNA's site, their 26 mount is black as well.
You can see the 21 mount here:
http://www.hobbyfever.com/product_info.php?products_id=4012
And if you go to OFNA's site:
http://www.ofna.com/parts.php?start=4000
Search for the number 51530 which takes you to a black mount.
That part on tower is silver...
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXKHF1&P=V
lol
Not sure if I helped or gave you a headache!