Nope, my van had the useless shocks.Did you originally have Nivomats before you switched to the coil overs? Can you give me more detail on what I would need to do please?
Also, the vans without Nivomats, people change up to them. So, I would assume vans with Nivomats should be able to switch away fro them.
Looking at an eBay listing for a USED set, they look very much similar to the normal shocks on the non-Nivomat vans.

01-07 Chrysler Town Country Dodge Caravan 2 Rear Nivomat Shock Absorbers Sachs | eBay
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The top of the Nivomat is cylinder is flat vs a dust bell cover. Otherwise it would be difficult to tell the difference.