General Motors option code
X1O — Vert Monsoon w/ Cass
X1O (Vert Monsoon w/ Cass): a General Motors factory option code recorded on 1 model across 1999–2001, with installs and price where a source states them.
1 model · 3 model years · 3 sources
Every sourced appearance
| Year | Model | As named that year | Price | Installs |
|---|---|---|---|---|
| 1999 | Pontiac Firebird and Trans Am | Vert Monsoon w/ Cass RPO | Unknown | 409 Reported |
| 2000 | Pontiac Firebird and Trans Am | Vert Monsoon w/ Cass RPO | Unknown | 281 Reported |
| 2001 | Pontiac Firebird and Trans Am | Vert Monsoon w/ Cass RPO | Unknown | 187 Reported |
Every row traces to the source it links from on that model's own year page; this table only collects them in one place.