I found that OMC had tanks made for them by Scepter in the early 2000's and those tanks resemble the OMC tanks marked marked Dura-Tank, they are almost the same in appearance but the threads are the same as a standard Scepter tank and the BRP/ OMC part number 0767525 will fit the tanks marked "Dura-Tank Essence" this appears to be a #08935 Scepter part repackaged. Be aware they have changed the appearance of this cap but it fits and works! I thank the Lady at BRP's Sturtevant, Wisconsin plant that helped me figure out this parts problem!