You've selected the hardware to save your life!

You made the right choice getting the special bolts, and will soon be saving a half hour of your LIFE every time you remove OR install the driveline.  The small 12 point head gives you enough space between the yoke and the bolt to fit a 1/4" ratchet or ratcheting wrench.  If you use bolts from the hardware store, they'll have a 1/2" wrench head on them, and you'll be removing 24 threads per inch a quarter turn at at time!

1310, 10 spline, CV yoke.  Most commonly used in Dana 18/20 transfer cases with 10 spline outputs.

Warning:  Check the major diameter of your part against the specifications below.  Using a caliper, measure the ID of your existing yoke (there's a picture of how).  You can also measure the shaft's major diameter, but you'll come up with slightly smaller number than the yoke (the shaft has to be slightly smaller or they wouldn't fit together).
 

Specifications:

CV Yoke

• U-joint size:  1310, CV
• Seal surface OD:  1.553"
• U-joint size:  1310
• ID (Major diameter):  1.125"

Hardware

• Diameter and pitch:  5-16"-24 x 1-1/4"
• Wrench size:  5/16" 12 point

Why the yoke is great:

• FORGED will beat the same part made from billet, or cast...period.  The forging process forms the metal grain along the contours, and results is a stronger part.  Forging also compacts the grain structure which nearly eliminates failures from voids or inclusions.
• FULL LOCK UP is what we call our u-joint cap retention method (see pictures for FULL LOCK UP vs little tang).  Almost all yokes have a little tang to retain the u-joint cap.  Catch that tang on a stubborn rock, and it breaks off.  Then the cap shoots out, and BAM.  FULL LOCK UP eliminates this problem by fully retaining the u-joint cap.