There is usually a small metal tag on the pump originally. Of course they tend to disappear. I think you will find there are a lot of pumps out there that will fit. That makes it tough as anything could be on there. The L134 was used in industrial and other places. I think if you look through the pumps KW has listed on line you might be able to identify what you have. In any event if the measured pressure is too high a spacer should do the trick. It appears you have a regulator, that will work just fine. Make sure you check it with a gauge to be sure it is correctly set. Changes in fuel pressure produce changes in the float level which can change the running characteristics of the engine. You do want it to be fairly close to prevent flooding or lean. I have heard the Legendary Solex likes 1.5 to 2 psi of pressure.