On the front of my van there is a tab welded underneath my frame rail, just inboard of the shock, that the top of my limit strap bolts to, the bottom bolt is shared with the shock. I do not have them on the rear at this time, but the same could be done by either welding tabs on the upper shock crossmember, or better yet, on the frame near the bumpstops which may benefit from taps welded to the axle outboard of the shocks to keep the pull straight inline. There's no standard size so to speak, just make sure that your suspension is hanging on the strap 1/2"-1" before anything else tops out, and the straps are as close to straight in line with the suspension's arc of travel as possible. A properly setup suspension should include bump stops and limit straps IMO, so no need to defend it as if it's some sort of band-aid.
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