Originally there were two different valve covers for the ESKA engines - one cover had two fuel nipples for both a built in and an external tank, and one cover was specifically made for a built in tank only and had just one fuel nipple. There now is only one valve cover with one fuel nipple for all the motors so it is possible you may have to adjust your fuel line for a difference there. It will fit the opening correctly, however, there may be a slight difference in the angle of the fuel nipple. If you have two tanks you will only be able to run a fuel line from one.
If you have a question whether this item will fit your engine, please contact us at doug@boatsportandtackle.com and provide us with the hp, year and model # of your engine and we can verify it for you.