Correct remo head for 11.75 LP traditional crown

Anybody know the right crimlock size for this? 11.75 Lp traditional crown, and just in case a 12.5 as well.
Thanks!
PC
Thanks!
PC
The World of Percussions
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http://www.mycongaplace.com/forum/eng/viewtopic.php?f=14&t=8664