Hi, As the subject line shows, I'm desperate. I have been working on the 383 for my wife's 64 Polara 500 ragtop and decided to put on a Thermoquad carburetor. I really believe that the Thermoquad is a great carb with the 800 cfm and spreadbore style will suit well with fuel economy and rubberlaying, teeth chattering, getting pushed into the seat acceleration too. My dilemma is that I broke 3 mixture screws from two different carbs and need some mixture screws. The carb is a 6139 SA (1972 340 version). The mixture screws for 1972-74 have a 20 degree taper and 1975 and newer have a 12 degree taper. I need the 20 degree taper screws. I suspect that any 6000 series carbs would work. I would like to get at least 3 so I can get both my carbs operational so I'll have a spare if need be. If you can help me please let me know at "krmerkleyatyahoo.com" We can discuss price, shipping etc. Thanks very much. K. Kevin R. Merkley Thunder Bay, Ontario 64 Dodge 440 2dr HT (Cdn) 64 Dodge Polara 500 Convertible (Cdn) ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.