The tag on the carb is the manufacturers part number for that carb. The Sierra number is the part number for "a" carb kit. The two numbers are not related. To make this a little more clear, assume the number on the carb tag is 12345678, and that carb is on a 1987 Chevy 350. Using the Sierra cross reference book, that carb would take a Sierra kit part number xx-yyyy-01. On the other hand, if the carb tag was 87654321 and was from a 1987 305, it might take Sierra kit part number yy-xxxx-02. You are dealing with three manufacturers. The engine (GM), the carb (Rochester, or ????) and Sierra so you need to know how to use reference books just like choosing an oil filter or plugs for your car. That carb number appears to be a Rochester two barrel so you could take that tag number to a GM dealer and likely get a kit for it. Or you can take that number to NAPA and they can provide the kit. Or you can likely get it right here on iBoats. The package may have a GM part number, a Rochester part number, a NAPA number, or a Sierra number depending on where you get it. As an example, I once owned a snowmobile with a CCW (Canadian Curtiss Wright) and in the search for a gasket set, I found one at a Mercury (snowmobile) dealer in Wausau, WI. There were two bags. The outer bag had a Mercury part number and logo. Inside was another bag with CCW logo and their unique part number. Repackaging and reselling is a very common practice so you need to know how to use parts books and cross reference listings.
