Ford dealer will definelty sell the fl1hp. the fl1 can be had at walmart for $4.00. the hp stands for high performance. The bypass valve does not open until a 17 psig DIFFERENTAIL across the filter. the regular one is 9psig?. Remeber your
oil pressure is just that not differential pressure across the filter. you probably have 55 psig going in and 53psig comming out of the filter. Ford dealer will charge about $15.99.