There's always a back story to tracks such as this .. so I'll share what I know
In the 80's a Motown collector associate of mine purchased a number of acetates and tapes that had been retrieved from the Woodward building in Detroit.
The tracks on the tapes were by various artists and were what we called 'safety copies' .. meaning you could listen to them but weren't able to move them on as they had 'bleeps' superimposed on the tracks at regular intervals throughout the songs. Our understanding is that these were tapes that writers or producers could take home to listen to and had therefore left the 'security' of the tape library and studio.
One of the songs on these multi-artist tapes was ' I Can't Stop This Feeling'. The tape was damaged on the intro but recovered in time before the main vocal started. A number of the long-time Motown collectors listened to it and the conclusion was that it must be a demo, probably by the writer or a random singer, as opposed to any known Motown artist.
My friend, at a later date, gave a copy to Ian Levine. who was very excited by it. He 'repaired' the damage by doing a piano studio overdub and proclaimed that it was a Contours recording and he knew because he had worked with them and knew their voices up close and personal, so in his mind there was no doubt. That is a difficult position to disagree with but none of us are deaf and not one of us had ever reached the same conclusion.
So ... my view is a simple one. It almost certainly is not the Contours or any other obvious recording artist from that era. We have, as far as I can recall (need to check) ever identified the songwriter(s) ... but is is more than likely that the writer is the singer ... it could be James Dean or William Weatherspoon ... the songs is in their style.. but in reality who knows
And in answer to the original question ..... No it isn't available on vinyl or any official CD release
Regards
Andy Rix