edit:
The Kadett "B" (a small saloon)was marketed by Buick.
The more interesting models were the GT (most of these went to America)from 1968 to '73:
Opel recently launched a new GT, being sold as the Saturn Sky in the US.
The Manta "A" between 1971-75
(unoffically a response to the Ford Capri Mk1 in Europe)
and the Ascona, the Manta's saloon cousin. This was simply marketed as "1900".
None of the post 75, B series cars made it across offically, although there are personal imports. First there's the Manta "B" avaliable in either 2 door coupe or 3door fastback/hatchback form. At this point the Manta had essentially become a coupe version of the Cavalier and was nolonger a stand-alone model. Confusingly, Opels were marketed in the UK alongside existing Vauxhalls but had a "sportier" image.
as per the industy later models recieved rubber bumpers when chrome/alloy bumpers were abandoned.
The B recieved a facelift circa 1984, sometimes incorrectly refered to as the "C"
These are the models I like as I remember one near my house that I was fascinated with (I use to go out looking for it).
Some of the small slaloons/hatchbacks were markedted as "Opel by Isuzu" by Buick dealers between 1975-78. not too great, apparantly, though they are linked with thre Isuzu Piazza which is a great donar car being 2.0 turbo.
There have been some badge engineered cars in America (early 90s Pontiac Lemans and Cadlliac Catera were the Opel Kadette "E" and Opel Omega "B" respectivly).
When the Rear Wheel Drive B series Cavaliers were replaced by front wheel drive versions in 1981 they were based on GM's world J-platform so Chevy Cavaliers shared the same underpinnings with Euro equivilants. The Manta was "replaced" by the Cavalier based Calibra in 1990ish.
Finally, we now have Saturn selling renamed Opel models (including the Astra and Sky) and is apparantly to become Opel(US) pretty soon now.
Phew! think that covers most of it![/img]