[jcblitz]

How did you order the part? Internet form, call a person and they told you what you needed, call someone and give them a part number?

What is the part number for the bracket they sent vs the one you need? I assume it's a standard damper and a specific bracket for your bike.

Nothing for nothing, but they're asking for legitimate information. If this was a high school math test, I would have to answer "Not enough information provided to solve this problem".

Go to GPR's website, get the model number for the bracket kit you need. If it's different than what you ordered and your fault, you owe them 20%. If it's different and they told you incorrectly, they owe you a replacement without 20%. If they sent you the wrong part, they owe you a replacement without 20%. If they sent you the correct part and you just can't get it mounted, you need to contact GPR. Sorry.