This is a USED part, but in excellent condition. Suzuki Part # 16100-31202 Fits Models: GT750 (1973) GT750 (1974) GT750 (1975) GT750 (1976) GT750 (1977) This listing is for one(1) OEM Suzuki oil pump. The physical size and output appears to be the same for GT550 and GT750. At the time of this listing we have a total of 12 different oil pumps but there is a bit of confusion as to the part #. Apparently Suzuki made several of these pumps with different #s, and the pump itself is interchangeable, with the major difference being in the lever. Some years/models use a cable driven lever and some are driven with a rod or arm. There is a great article on this subject at: http://pinkpossum.com/GT750/Oilpump.htm (Copy and paste in your favorite browser) This is a must read,if you can't get to the article contact us and we will direct you. I've read another article that states these can also be used on GT380. We are not recommending that you do this, but passing on info. DO YOUR OWN RESEARCH AND PROCEED WITH CAUTION.AN OIL PUMP IS A VERY IMPORTANT PART OF YOUR ENGINE. WE TAKE NO RESPONSIBILITY FOR DAMAGE IF YOU USE THE WRONG PUMP. REFER TO YOUR SERVICE MANUAL OR LEAVE TO A QUALIFIED PROFESSIONAL You must contact us before selecting Buy It Now. Let us know which pump you want. We will sell according to whether you want one with or without the pin (photo 1). Photos 2-4 shows different levers and where the number is stamped. We will try to find one with the same number if available. At the time of this listing we have pumps with levers stamped with the following numbers: 310 1 each 330 4 each 331 2 each 340 2 each 341 1 each 1 with no # (Before placing an offer check if your # is still available) We recommend using your old lever as this seems to be a major difference. All pumps have been tested to make sure the center shaft spins freely. No other test has been done.