I ordered a balancer from rock auto,and they sent me the front pully.part no 337594-037.I called and they said they had the balancer and gave me the part no 102059.When I punched in the part no on the rock auto site,it shows a picture of a balancer,but it says 6.2 next to it.Are the balancers from the 6.5 and the 6.2 the same? Thanks,
Nick

Same - BUT different.

6.5L EFI requires shorter snout for Crank Position Sensor reluctor.

Balancers for 6.2 and 6.5 manual fuel injection have longer snout

Ok,in either case,would there be provisions for 2 woodruff keys on the crank?My new balancer came with 2 keys,only one was being used on my truck.Looks to me I would need to pull the cover to use both.By the way,the key slot in the old balancer had excess clearance.The new one is quite snug.The noise is less noiticeable,but still present even with the new balancer on.My truck has a manual pump on it,and I believe the balancer is the smaller of the 2 sizes available.Could it be the problem?Both the old and new are the same size,and both had only one key holding them in place. Thanks again

Nick

Double keys - one you saw, another in the drive sprocket.
Only one size balancer, different snouts, iirc - both with external balance mass for the crank.

Best wishes on your trip............