This will be a tough question to answer, and here it goes: were there any Orion I's built in 1984 and 1985 that used the Voith D863 transmission behind the Detroit Diesel 6V92TA engine (a la AC Transit's 1984 Gillig Phantoms numbered 1469 to 1483)?
They can be model 01.502 (30 ft), 01.507 (35 ft) or 01.508 (40 ft).
~Ben