I hadn't realised that Brocks car was the 1988 Rouse car. I always just assumed it was a Rouse customer car. In fact, Brock had at least two Cosworths, and possibly even three. He ran two cars in both 1989 and '90. Must have been depressing to then end up back in a Commodore in 1991. The reasons given for the switch at the time were the costs of running the Sierras.