I've been doing some research and got under my expy and a buddy's f-150 and they look identical. I also ordered some Bilstein 5100 for an f-150 to put on my expy, looks like it's going to be a perfect fit, but they still don't have interchangeable part numbers. It looks like F-150 struts may be about a half inch taller. Here's the specs for Rancho Quick lifts for both.
F150 rancho
Compressed Length: 17.190
Extended Length: 22.210
Travel Length: 5.020
Body Type: SS3
Expy
Compressed Length: 16.700
Extended Length: 21.710
Travel Length: 5.010
Body Type: SS3
F150 rancho
Compressed Length: 17.190
Extended Length: 22.210
Travel Length: 5.020
Body Type: SS3
Expy
Compressed Length: 16.700
Extended Length: 21.710
Travel Length: 5.010
Body Type: SS3