Two of the West Midlands' major industrial sites will end up outside the new regional super council when it is formally launched next year.
District councils covering the i54 plant near Wolverhampton and Hams Hall near Coleshill will not be part of the new regional economic policy area covered by the West Midlands Combined Authority (WMCA).
Both i54, where Jaguar Land Rover is based, and Hams Hall, home to BMW, are major employers and sit at the top of massive supply chains.
Both South Staffordshire and North Warwickshire are among district councils voting to stay out of a West Midlands authority.
But confusingly the Coventry and Warwickshire Local Enterprise Partnership (LEP), the business investment agency covering the North Warkwickshire district and Hams Hall, has signed up for membership.
The seven metropolitan districts - Birmingham, Solihull, Coventry and the four Black Country councils - are forging ahead as core members of the new WMCA.
While a patchwork group of surrounding districts are currently opting in or out.
So far Tamworth, Redditch, Telford and Wrekin, Nuneaton and Bedworth have all voted to join as second tier associate members. The Black Country, Greater Birmingham and Coventry and Warwickshire LEPs have also signed up.
But South Staffordshire, North Warwickshire, Warwickshire County, Worcestershire County, Warwick and Rugby are definitely out. The Warwickshire councils were hopeful of persuading Coventry City Council to come in on a separate combined authority with them but have been unsuccessful.
Bromsgrove and Wyre Forest councils have decided not to join at this time but remain open minded about signing up in future - once full details of membership are thrashed out.
Wyre Forest's Conservative leader Marcus Hart said: "Our current position is that we are not minded to join the West Midlands Combined Authority at this time because of uncertainty about its functions and responsibilities and in particular about the role that non-constituent members would play in it, including voting rights."
Lichfield District Council, whose Tory leadership has been positive about the WMCA project, are set to vote on October 13.
It means there will likely be a settled group of seven metropolitan cities and boroughs at the heart of the authority but a disparate group of surrounding districts.