Air-Dog FP-100 adapter

[GSchneuer]

I have an Air-Dog FP-100 installed on my truck and I want to up-grade the filter from an FS5613 to a Cat 1R-0750. The FS has a 7/8th's hole and Cat has a 1 inch. Does anyone know where I can procure a threaded adapter that is 7/8th's ID to a 1 inch OD?, I have seen these someplace before but I can't find them now.



Thanks, Gary