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Old 08-17-2020, 07:26 AM   #15
L-head
Senior Member
 
Join Date: May 2010
Posts: 163
Default Re: What years are these hydraulic backing plates???

Mart is dead right on this. They are off 91D (3/4 ton) trucks; maybe the 1 ton trucks also. Notice the "round" shadow where it bolts to the axle housing. The the two small holes mount the emergency brake cable.
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