At some point all the service parts had the econoline features. I’m guessing it’s because the econolines were made into the 90’s and they consolidated parts to the one mold and emblem type. Chris McGaugh has the NOS XLS horn pad with the E2 prefix on the part number and it has the econoline characteristics as well...
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2