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Here is a side by side comparison of the Road Kings 1967 Peterbilt 379 and the 1989 Kenworth W900
https://rumble.com/v27ecm5-1967-peterbilt-379-and-1989-kenworth-w900.html
Not really being a "semi/rig" guy I didn't realize these two trucks were different makes until just a few months ago. I thought it was just the PB in different liveries.
The Road Kings PBs were the very first K&K release; they have chrome plated METAL bumpers. Cool right! But I noticed that on my other, later releases, the bumpers are chrome plated plastic.
Does your KW have a plastic or metal bumper?
Both the Peterbilt and the Kenworth have plastic bumpers on the two trucks I have.