Item US0321 has must read information.
Comments: Must confirm the markings on the side of the pads being replaced before placing an order. There are 4 separate pad sizes, identified by markings 577, 579, 581 & 583. Pads must be replaced with the same pad sizes as originally installed. JLG part numbers have been issued for each of the pad sizes as follows: JLG P/N Original Pad Marking US03211 577 US03212 579 US03213 581 US03214 583 
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MAST SLIDE BLOCK

Net Item: No

Item Number:
US0321

Shipping Dimensions:
Weight: 0

Unit of Measure:
EA
Consult Factory:
Yes
Shipping Type:
Parcel
MAST SLIDE BLOCK - US0321