I can't remember how long the ones were on Chris' ( sperb) when we did his BDS lift, I'm thinking they weren't too much longer over stock. IIRC, we had to make sure 1 or 2 of them had to be in the top plate when we put assembly together as isolator covered them (they were toggle type bolts with square under heads).
The BDS top plate bracket is similar to the Daystar top plate I think, not sure what this "pretension" is about, looked similar a stock one other than the center section was recessed about 1-1 1/2"
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'99 Tahoe, 3" BL, 285/75/16's , MT II's.
'05 Liberty Sport, -wifey's
'98 Poncho Fireturd, 3.8L, .....the purple pig!

