I don't have a spare lying around. I can measure mine and send you dimensions, if you know anyone with a 3d printer. That's what I've been doing for my missing silly interior trim pieces. Works out pretty well, except my bud with the printer is in the UK so shipping takes for-freaking-ever.
I only offer because the hard tops are pretty rare, so I doubt you'll have any luck finding a piece out of one. Who knows though, perhaps you'll get lucky.