Sorry, Bart, although I've owned a couple of of those Mullane/Tennessee-sabot Conversion projectiles in the past, I don't currently have any. So, to fulfil your request, I did a websearch, but was unable to find a photo of one, anywhere on the internet.
They are "listed" in Ridgeway's internet relic-archive, but no photos of them are there.
The good news is that there are photos of the 6.4" Tredegar-to-Mullane and 6.4" Read-to-Mullane conversions in Jack Bell's book, on pages 421 and 422.
If I recall correctly, photos of them are also in the 1972 Kerksis-&-Dickey book on Heavy Artillery Projectiles.
Regards,
Pete