Kelsey Hayes Brake Caliper Washers

For you guys with brake experience, I'm finally ditchig the 50 year old drum brakes for some disks using the 4 piston Kelsey Hayes style calipers. The only thing I seem to be missing is the seal or crush washer that is installed between the caliper and flexible brake line. Anyone know where I can source the right washers for this?
 

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