Here is the page(s) for the M686 from the S&W website.
Med. Frame (K/L) - Smith & Wesson
I thought that they would list the current dash numbers, but I can't find them. Maybe you could explore the site a little more and get them yourself. Try their 800 number if all else fails.
Quote:
By Telephone:
1-800-331-0852 (USA)
Mon-Fri 8:00AM-8:00PM Eastern Time
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Sorry I can't be of more help but I don't keep up with current production since I am in the camp that cries in its beer about the good old days.