I looked carefully at the raffle items for RFTH 22:
3 Light Sequential Turn Signal Control-New
1 Gray Performance Sound Control
1 Beechwood Performance Sound Control
1 Underdash Performance Sound Wiring Harness
1 VGC Beechwood Auxiliary Gauge Pod with Harness
1 Fiero Blvd Heavy Aluminum Street Sign
1 Hot Wheel Pavement Pounder Car Carrier with Fiero. Unopened
1 American Graffiti 1985 Fiero GT by Motor Max
1 Pair Tyco Slot Cars
1 I Love My Fiero GT Button
1 Gold Fiero Nose Emblem New But Blemished
1 Gold Embroidered Fiero Patch
1 Fiero Parking Only Heavy Steel Sign
1 1:18 Road Collection Fiero GT Unopened
1 88 Pontiac Product Book Fleet Edition Ring Binder with inserts. Excellent
1 88 Fiero Owners Manual. 8 of 10 Quality.
1 84 Fiero Owners Manual and Maintenance Schedule. Slight Cover Blemishes
1 Set of 1995 Fiero Store Product Brochures with Price List.
1 Set of 3 Fiero Owner Magazine, First, Second and Third, Fourth Quarter.VGC
1 Fiero Connection Magazine Featuring Mariana Martin’s White Horse. VGC
1 Hot Rod Magazine March ’84 Featuring 140 MPH Fiero. New In Sealed Wrapper
1 Brookland’s Road Test Magazine ’84-88 Fiero. Sealed. Excellent
1 Pontiac Road Cars Magazine, 1988 Edition. Sealed. Excellent
1 Gary Witzenburg Fiero Pontiac’s Mid-Engine Sports Car. Sealed
I didn't see a supplemental, or a DIY, or an owner's manual update book. I suspect that the owner's manual update was only for previous years, probably something to do with the recall. I traded a full set. I don't foresee having another '86, but I think those were hard to find.