MAKG,
where are these 5.5mm holding the EVAP box in?
All the evap boxes I've seen were held to the firewall with NUTS,
typically 7/16(common english size) not the far smaller 7/32" (5.5mm)
and the evap box itself is usually held together with screws with
8mm hex heads.
and for the record that tiny 5.5" IS used in other locations... holding the Cruise control
"brain" in place under the dash, holding up gen1 hood release handles, on 4.0's a 5.5" holds the EDIS module to the firewall and on ALL Gen ones the "jesus handle" above the door is held in with 5.5mm head screws.
they are found in other locatons as well, but I can't bring them to mind at the moment.
AD