Coachbuilder Shackle

I already know I'm going to pay for this stupid question but I can't see what I am missing. This pic is directly from the Coachbuilder website but it seems to show you can buy 1 shim for $18 or 2 for $72. The description for both seem the same and the single gives you .5" lift while the pair gives you of course 1" lift. Please tell me what I am missing.

 

$18 shims are 1/4”
$72 pair of shims are 1/2”

 

What he said☝️
Single shim vs pair of shims and size diff.
I believe some ppl will use the single (thinner) shim on the driver's side to level out the left side lean that some folks absolutely notice and cant stand on their rigs.

 

Change your title to coilover shims. Shackles are in the rear.

 

Thanks all for the quick response and not sure why I put shackles.