Spring shackle skid plate

[Hal]

Here's my Amstar skid plates, picked up today, got the service manual a few days ago too


Installation surprise follows... READ THIS: the Amstar instructions say you must remove and discard existing U-bolts and nuts, but retain the washers ( ) and replace with new GM u-bolts and nuts or void any warranty for the skids.
Is this standard procedure ?? guess I got to drive 100 miles round trip back to the dealer for that wish I knew ahead of time. ANYONE KNOW THE REASON FOR THIS? (serious replies only please)


Some powder coating on the edge of skids is already falling off, but hey, I plan to make even more come off myself.
Oh yeah, you want to know the price... skids from dealer $210 plus tax! and the service manuals from Helm $135 plus shipping! Ouch and Ouch!