hemi-itis, basically the same as you. I have a single line external set up . As you, I want to filter the oil before the pump. Reason is my buddy just ruined his engine from a a broken lifter wheel, sent pieces of needle bearings into the pump which ground them up so fine they went through the Fram filter and though the complete system . I was looking at the Peterson 09-0408-12an. It's the filter with the 90 on the end which would screw onto the fitting coming out of the pan. I guess i'm looking for what micron to use and why a dry sump would be different than a wet as oil is pulled through each. Or is it that Peterson in their description didn't think anyone would use it in a wet sump external line .