For 1968-1972 Buick Skylark Bosch Drum Brake Shoe Set Rear. Buick Skylark Drum Brake Shoe Set. 1968 Buick Skylark Engine: 5.7L V8; with 9.50 in x 2.00 in Brake Drum; Position: Rear;. 1969 Buick Skylark Engine: 5.7L V8; with 9.50 in x 2.00 in Brake Drum; Position: Rear;.