Flathead filter

[F1Fred]

I want to install a filter on my EAC. I have tried in the past using a filter that came with my engine. I connected it, as shown in JM 35 SEDAN's illustration, but there was so much pressure oil leaked around the cap. Ive been told I need a "restrictor". I have tried, without success, to find a restrictor. Is this a part that was provided by Ford with the filter or is there some fitting or adaptor of some sort that can achieve the necessary restriction. I also have a finned System 1 aftermarket filter I could use, but still think I should have some sort of restriction to the input. Any help would be appreciated.