I have a older style carter 2 barrel BBD carb, model #6150SA, that im looking to buy a range of main jets for. The jets in the pic (if I attached it right) are the older stlye, that have a shank assy attached to the jet, with 4 holes in the bottom, that apear to be a guide for the metering rods. Anyone have these or any ideas where to get them at? All Im finding so far online is the newer style jets in the pic. Right now I have a 120-309S which too rich, thanks in advance for any help!