QA1 Adjustable Upper Trailing Arms - 64-67 GM A-Body 91609069 570" ID that works well

570" ID that works well with our 938 and 927 dual valve springs

1964-1973 Buick LeSabre

DMI 2-7/8 in Smart Tube

5/8 in Hex Head

but they're also designed specifically to fit our intakes and cylinder heads

QA1 Adjustable Upper Trailing Arms - 64-67 GM A-Body 91609069 570" ID that works wellAll upper tubular and lower boxed trailing arms use polyurethane bushings on both ends, while upper adjustable and lower tubular trailing arms use a spherical ball or rod end assembly on the chassis end to eliminate bushing bind, allowing the suspension to move smoother for better control. This keeps the tires planted firmly on the ground for improved traction and a more predictable, better handling car. For a long lasting finish, tubular and boxed