I have found out that the factory 67 bump stops fit even after the frame mod. They bolt back in their original holes. 68 and 69 could use the same, just a 5/16 self tapper.
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Rich Bermea
Road Touring Customs
Gilroy, CA
I bought the DSE mini Tubs for my 69 and followed the directions in the instructions/video and the mount location for the snubbers was cut out. I'm not for sure but remember that the 67 has both shocks on one side of the axle while the 68 and 69 shocks are staggered on either side of the axle. Could be that the snubber location in the 67 remain due to that fact.
I think that using leaf springs has a different bump stop location than a replacement rear suspension set up, as suspension travel might be different for different set ups. (example - one coil over shock set up might bottom out at the coil over before it bottoms out on the frame, therefore check full compression of each side, and both together, and install as required).
I'm not there yet but I intended to fabricate a bracket and install a bump stop once I have my Chassisworks g-link installed, just to keep my rear from bottoming out on the coil over shocks, as Chassisworks shows that the shocks bottom out before the rear hits the frame.
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DETONATOR - 69 Camaro RS
LS1 - T56 - Chris Alston Frame - 2" drop
G-Link Rear - 4.20 gears in 9" - Mini Tubs