These are very slightly used, they were in my LT1 TA for about 2-3 weeks, then other issues caused me to pull the heads and go a different direction. These springs have absolutely no marks on them what so ever from any wear. I also have a set of just the springs that are brand new listed on here by themselves.
Specs:
PAC 1518-16
Premium Nitrided Beehive LS1 Spring
OD: 1.290"
130 lbs @ 1.800"
337 lbs @ 1.150"
Lift: 0.650"

Not sure what the part numbers are for the retainers and locators, they go with these springs though. I have 2 sets of locks, 1 set is the 614-16 which are 0.05" extra install height. I believe the other set are the base locks, not sure since I do not have the original packaging, but you can have them as well in case they work for you.
$200 plus shipping.

 

I'll take $175 plus shipping

 

Lowering to $150 plus shipping before going to auction site.