Boss 429 smog pump clamps are different but 429s used the thinner #2 bypass hose clamps that are hard to find and I been collecting them for last 30 years finding them on gm smog hoses etc. The bypass hoses also are different depending on engine and plant some have ribs and some don't. We were selling the #2 thin bypass hose clamps on ebay but not many sales as people didn't want to change them out once engine was already painted and installed and u have to put the (ole hawyeye) on the clamps to notice the difference.