Mini Version 3 Engine Baffle Ignition Wire Seal - Two Wire
 
Lycoming, Continental, and others
 
A part to pass spark plugs wires through the engine cooling air baffle.  This part is smaller than the Slick version.   Uses #8 washer head screws (included).  Max temperature = 300 Fahrenheit.   Maximum center hole size = 1.0-inch.  The drill jig includes hole guides at the center, and the center of each hole to help fabrication, if a slot is desired. 
 
A drill jig is recommended for drilling the holes to mount the seal because the holes have a line fit.  Using the seal as a drill jig may oversize the holes and reduce the tight clearance fit.  A free drill jig will be included with the purchase of two assemblies in order to complete the installation for the engine.   I didn't have much luck drilling the center hole with the large step drill as it would not hold center position, perhaps you can do better.  Recommend a circle drill or a hole punch.  The center hole in the photo = .725-inch diameter.
 
Note: These are priced and sold per assembly.  Each assembly contains 2 pieces.  The item will ship exactly as pictured.   
 
Installation
Use #40 drill bit at drill jig to locate holes in sheet metal
     1.    Drill and then cleco each hole sequentially
Open sheet metal mounting holes to .166 - .175 inch dia.
Open center hole as desired, maximum 1.0 inch diameter
Recommend to use metal locking nuts
Torque AN525-832R10 screws to 10 in-lb or 1 N-m, consider metal lock nut running torque