YUP aftermarket replacement... prob nothing special. i have never heard of the brand (Autotech engineering) out of Fontana california

http://c2c.activant.com/ctoc/index.jsp?ID=aEz1sGyk_BU56OTV_CUdGM2xEVVM6BVYKXj0A



however they are considerably inexpensive for what looks like a birf and a inner shaft... i can get em for 45$ with a 25$ core... really never thought bout it, but i am kind of surprised you can get these still.... lol