As Jordan said, marine supply and fabric etc stores. But he warned, there are subtle differences in the snaps, one of which is the amount of clearance above screw head. If screw head is projecting too much then corresponding snap will not snap on fully.  Of course the style and size of sheet metal screw is important too, but the depth of the van affixed snap can bite you.

Alistair

> On Nov 24, 2016, at 10:49 AM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> happy Thanksgiving to all... ! ! !
> 
> I bought a used set of snap on curtains for my tintop. I would like to know
> what kind and where to find the opposite part that screwed on the van to
> attach the curtains.
> 
> thanks in advance if you have any info to share...
> 
> dan