The #12 heads have screw-in studs. You can use poly-locks with those studs, or buy some cheap 7/16 studs, & use poly-locks with them.
Some seem to think you can't run poly-locks with the bottleneck studs. But I did it for years. Never broke a stud. But, for only around $30 or so, you can buy 7/16 studs. Or, if you have a good BBC friend, you may be able to find some used factory BBC studs, real cheap.
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