I have a set of 3 chrome plated velocity stacks that I won't be using. The chrome is solid driver condition and they attach with three set screws. Dimensions are: Top opening: 4-3/8" Bottom opening, where it would attach to the carb: 2" Height: 1-3/4" The attaching screws go through three solid bosses on the inside of the stacks, and even though the carb opening is 2" it could be opened up to 2-3/4" to fit a specific need. Shipping via USPS Priority Mail Flat Rate in the U.S. is $12.65. I take Paypal. Let me know if you have any questions.