I've seen (and posted) a wire shot of Bennett seen at his clubhouse cubicle during his very brief stay with the 1967 Mets (they traded for him on June 24 and sent him to AAA after his last appearance July 31, and was also idle for two weeks in that span).
But this image is from an actual Mets' publicity photo up for bid on eBay:
1967 Dennis Bennett New York Mets White Borders Baseball Photo | eBay
Nothing has yet turned up of Bennett in New York in color.