I have (3) believed to be OMC aluminum 3-blade pin drive propellers seemingly for the 28/33/35/40 horsepower applications. The first casting number is 311837, a second possibly is 304825, and the third simply cannot be seen if there is one, but does appear to say "11 1/2", so #378581 is suspected. Might someone know of the casting numbers for the first two? Thank You in advance.