Ridetech 4 link install help

[BeerB8AmmoGRITS]

I've searched around and found a few threads where it seems like people had a similar issue but they never elaborated on what they did to correct it so I apologize if this has been answered before.

i am currently installing the ridetech rear 4 link into my mini tubbed 68 camaro, and have already had several of the self tapping bolts strip out.... To me, this just doesn't seem like a good way to attach something like a suspension crossmember that will be supporting the whole vehicles weight (just a few threads the thickness of the frame rails). I'm using a 5/16" drill as said in the instructions but before I can even start to snug the bolts down they start spinning.

in case you were wondering I was not using the tightening of the bolts to move the crossmember into position and make it fit. It was already in place and I was just snugging the bolts down.

i would prefer not to weld the whole thing in because it would be good to remove if necessary but I am not liking the way these bolts are working.



The one idea I may try is using 5/16s rivnuts and bolts instead of the self tapping bolts in the kit. Anyone done this? Anyone have a better idea?

Thanks!
Adam