Check the listing for details. HOLLEY 4150 CARBURETOR ACCELERATOR PUMP STUD W/ CLIP DOUBLE PUMPER 650 750 850. Condition: New. Listed at 12.95 USD. This is a pair of new accelerator pump arm studs and clips for the Holley 4150 series 4 barrel carburetors including models 4776, 4777, 4778, 4779, 4780 9380 and more that use the old style arm and clip as shown. Fits 600, 650, 700, 750, 800, 825, 830, 850, 950, and 1000 cfm carburetors. Included are 2 pump arm studs for the 30cc pump levers and 2 e clip retainers. These can also be used on most other brands 4150 including Quick Fuel as well as the early BG claw carburetors. Be sure and check our store for more carburetor and fuel systems service parts.We have been providing tech and working with the modular style carburetors since the early 90's. BG,Barry Grant,Demon,Road Demon,Speed Demon,Mighty Demon,Race Demon and Holley are all registered trademarks of HPI to which we have no affiliation.These parts/components are not manufactured by HPI. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov As of July 9th USPS has combined all non priority shipping including First Class into 1 service called Ground Advantage. Any listings that state we ship First Class will now be shipping Ground Advantage. Ebay is supposed to be updating this in the shipping section of the listing however to avoid any confusion if our description states First Class there is no more First Class available. They are telling us standard delivery times will stay between 3-5 to most locations as before however we have no control over these changes. Ebay will also be updating expected delivery dates if there are any changes there.