By BRUCE NEWTON The Age Wednesday June 1 2005 The iconic Monaro is a long-term must in the Holden line-up despite a decision by parent General Motors to halt co-development of a series of new models. That was the defiant message from Holden managing director Denny Mooney last week as he sought to play down the impact of cash-strapped GM's halt of the "Zeta" program. "We need a future Monaro," Mr Mooney said. "It's such an image car for us and our brand that we are going to do one. It is as definite as anything can be. I don't control everything that goes on in our organisation . . . but I have to tell you that from a Holden product plan standpoint there will be a future Monaro." Nevertheless, Mr Mooney admitted a business plan for another generation of the high-profile coupe had yet to be signed off. Monaro looked to be an immediate beneficiary of the co-operation driven by GM car tsar Bob Lutz, which called for a series of North American models to be developed over the next few years underpinned by the Holden-developed Zeta architecture (core structure). Zeta will debut on the VE Commodore sedan early next year and gradually be introduced as other models are updated. The Monaro would have been built in North America, primarily as a Pontiac GTO, with some sent south to sell as Monaros. Currently Holden builds the Monaro in its Adelaide plant and exports a 6.0-litre version to the US as the GTO. GM's North American financial woes have seen plans for a new generation of rear-drive cars waylaid by the need to get high-profit margin off-roaders to market quickly.