Both the 751's and the 779's are considered to be HD front springs. The 751's, although they were designed for the Classic, D1 and the Defender, give the D2 more support in a D2 the the 779's do if you are going to running a winch and bumper.
If you aren't going to go with the bumper and winch, stay with the 779, although still considered the HD coil for the D2, it will ride a little better unloaded.
Mike
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