before my bars and blocks I used clamps.
Now the specs are most likely different for your truck as these were on a 2500HD duramax.
I went to a made to order u bolt shop and got 3" wide 4" long, 3/8" U bolts made.
Then I simply made plates out of 3/8x1.5" strap and drilled holes in them. Simply slip the u bolts over the overload spring near the end of it. Place the plate on the bottom and use an impact to torque down.
I clamped both front and back on the overload springs for a total of 4 clamps.