Single shear- is the way the factory shock mount is designed. The shock mounts to a stud sticking out of the shock tower. Where the shock meets the tower is where the "shear" load would be. Perfectly fine for regular shock duty but seems like alot when you put the whole weight of the car on that single spot.
Double shear- is how I re-made mine in the pic above so that the shock bolt goes through
two mounts,one on each side of the shock to distribute the shear load across two points instead of one side.
BUT, I prolly just over did mine
. LOTS of folks out there running coil overs in single shear. I've even seen pics of race buggies with coil overs mounted in single.
Definately upsize the bolts though
.
Jeff-