Carlson's CHOKES for Beretta EXTREMA 391 Optima Plus

Hey guys, I was just wondering if anyone had or knows which Carlson's Extended Steel Shot Choke would fit my Extrema? I know it takes the OPTIMA PLUS Chokes, but the Carlson's website doesn't straight up say Optima Plus choke = Serial ######. Anyone know? I'm looking for a mid and long range one for ducks and geese. The websites say for Ber/Ben, but from what I can tell there are multiple Ber/Ben chokes out there?? THanks! Thomas

http://www.choketube.com/choke-tube-product-details.php?Beretta-Optima-Plus-Choke-Tubes&mf=7

Beretta Optima Plus
Interchanges with Carlson's Optima Plus threads (Models 391A Extrema and 12ga. 391 Teknys)

http://www.berettausa.com/products/optima-choke-plus-extended-matte-black/

http://www.berettausa.com/products/optima-choke-plus-tube-12-ga/