Dennis, 

You will want to order the 14g weight.  This can be ordered through any authorized Titleist retailer.  Make sure you let the golf shop you go to know you spoke with Titleist and that they can indeed order these components.  

Below are a few places you can visit to order:

Golf Galaxy #3026

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6148 STATE STREET S; STE. A
SALT LAKE CITY, UT 84107 (1.9 miles)
801-747-0700

Murray Parkway Golf Course

6345 MURRAY PARKWAY AVE
MURRAY, UT 84123-6900 (2.0 miles)
801-262-4653

Edwin Watts Sy113

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10855 S STATE ST
SANDY, UT 84070-4104 (4.0 miles)
801-571-5770

Cameron 

1-888-TITLEIST