Alright Uncle Papa.
Here's some oil filter stuff I'd gather on the ER-6N and the engine that is in my vehicle and a sandwich adapter.
Courtesy of WIX.
ER-6N
Part Number: 51358
UPC Number: 765809513587
Principal Application: Honda Motorcycles + Industrial Engines, I-R, Komatsu, Kubota, Kia (95-05), Mercury, Arctic Cat, Nissan (06-10), Polaris, Subaru (06), Yamaha, Other
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 2.782
Outer Diameter Top: 2.685
Outer Diameter Bottom: Closed
Thread Size: 20X1.5 MM
By-Pass Valve Setting-PSI: 8
Anti-Drain Back Valve: Yes
Beta Ratio: 2/20=13/52
Burst Pressure-PSI: 265
Max Flow Rate: 8-10 GPM
Nominal Micron Rating: 21
Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.475 2.173 0.233
'98 Chevy Tracker 1.6L
Part Number: 51348
UPC Number: 765809513488
Principal Application: Various Chrysler/Jeep (82-10), Various GM, Saturn (85-07), Lexus (90-10), Saab (67-09), Suzuki (86-02), Toyota (88-10), Ford (03-10), Mazda, Mercury (05-10), Yugo (86-89), Various Lawn&Garden, Farm Equip.
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 3.404
Outer Diameter Top: 2.921
Outer Diameter Bottom: Closed
Thread Size: 3/4-16
By-Pass Valve Setting-PSI: 8-11
Anti-Drain Back Valve: Yes
Beta Ratio: 2/20=21/37
Burst Pressure-PSI: 275
Max Flow Rate: 7-9 GPM
Nominal Micron Rating: 21
Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.734 2.430 0.226
Perma Cool oil sandwhich The sandwhich is the same 1" one, but the adapter is different which each model. The ER-6N threads are 20mmx1.5 So you'd need the Perma Cool 186 sandwich adapter.
http://www.summitracing.com/parts/PRM-186/
Nipple Thread Size 20mm x 1.5
Inlet Size 3/8 in. NPT
Outlet Size 3/8 in. NPT
Notes 1 inch thick. Use 0.500 inch oil lines. 2.500 and 3.125 inch O-rings included.
The adapter on my vehicle is the same but with a different adapter and just one O-ring size. Not sure why the 186 has two different size O-ring sizes on it, but hey it fits two different diameters.