I think the closest to an Ecto you'd find would be the '59 Cadillac Limousine but would need modifying.
You'd probably be better off making a mini one yourself by 3d printing something in resin and attaching it to a preexisting chassis. I'm sure if you googled for an "N scale" Miller meteor you'd find one. Or simply scale down a larger model to 1:160.
https://www.shapeways.com/product/3YK8K ... -160-scale
There's an N scale ecto 1
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