The short version:
Classic had pretty correct 15" and 16" replacement blades in their catalog.
But they only had the 16" refills. When I was ordering I asked about the 15" - since obviously "OER" "made" the refills for the new blades. Salesman said he'ld find out. He got back to me saying they were looking into and then he disappeared.
OER seems to be some sort of operation without any manufacturing facilities of their own. Found a street address and looked on google maps and its some sort of office building and maybe a showroom.