As Skip Fix mentioned, the good slapper bars are long enough to put the snubber right under the center of the spring eye, and have a built in plate to replace the factory spring plate. I don't think any other style is of much use as a traction aid. My son's 69 Bird is running a set of the CE slapper bars and they do a credible job.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car.
79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet.
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