Firestone 6859 224C Ride-Rite Double Convoluted Standard Air Spring Compressed height is 2.80 inch Ride height is 6.00 inch -7.00 inch Maximum diameter is 8.00 inch Air inlet hole sizes is 1/4 NPT = 0.46inch, 3/8 inch -16 x 3/4 inch studs; 3/8 inch -16 x 3/4 inch studs