i have poly mounts on my longhorn due to clutch linkage issues with the tilt front clip. the cab wanted to squirm around on the frame with only 4 mounts. The poly mounts tightened that up, & gave me back the "feel" on the clutch peddle. they do ride stiffer than the rubber mounts, but I havent noticed any squeaks. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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