Sadly, the filter I bought has no arrow on it, but the one I removed did. One end of both filters has a metal seam around it and the other is smooth. I guess they would go on the same way which is why I asked about that seam.

__________________
1987 250D
1984 300TD
1983 300D
2002 Chevy 2500HD Diesel
1995 Dodge 12 valve Cummins Dually
All Biodiesel Powered