I am replacing my 3 blade stock quicksilver prop(13 x 19), with a 4 blade solas(13.75 x 19)on a 1991 115 mercury inline 4/ 2 stroke, I am 100 miles from any shop, so I must order by mail. Do I need thrust washer, anything else? the new prop comes with pressed rubber hub, thanks for any info.(also, what size prop wrench?) Thanks again.