dang, just got an email back from them saying the following:
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Dear Ryan,
Thank you very much for your e-mail and your interest in our range of
products.
We are very sorry, but the parts of our orange Catera are concept parts
and we will not produce them.
This car were made in corporation with GM in the USA for a Catera
event.
We, the company Steinmetz GmbH develop parts for Opel models. Due to
the reason, that the Catera has big differences with the european Opel
Omega we do not offer any parts for this car.
In the enclosure you will find our price list for Omega B parts. You
can use the following parts also for Catera models:
- interior parts
- wheels
- springs
Please do not hesitate to contact us for any further information.
With kindest regards
Steinmetz GmbH
O p e l-T u n i n g
Dimitri Nikolaou
Export Manager
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So, looks like steinmetz is more or less out as an idea...