[myoldchevytruck]

Yes they do. I did the swap from leafs to coils last year in my 69'. Here are the parts for the change over:

Trailing Arms and Coils with all associated hardware
Cross Member Brackets x 2 (I purchased these from a board member )
Frame Bracket for Track Bar x1 (I purchased this also from a board member)
Axle Perches for the Trailing Arms to mount to (You can purchase these from ECE) (Unless you are swapping your rear end out with them already installed) (Also note that a your axle now probably DOES NOT have the stud next to the pumpkin for the track bar to mount to)
Rear Shock Relocator Kit (You can purchase this from ECE)

Question? Are you going to lower your truck? I did 6 inches (6" drop springs from GMC Pauls). I used the Super Trac Bar from ECE. The Super Trac Bar installs to the frame bracket on the D/S and goes to the P/S mount for the trailing arm at the axle.

When putting on the the new brackets, I used all Grade 8 nuts, bolts and washers. I also changed the bushings on the trailing arms.

This is not as complicated as it sounds. with all the parts on hand, this can easily be done in a weekend. I also painted the back half of the frame, trailing arms and axle. If you have questions, pm your phone number.