I have one of these.
http://www.summerinfant.com/metalexpansion6footwideextratallwalkthrugate
It is in good condition and works perfectly fine. It is dusty as it has been in my garage since I moved in here last year. I am missing one of the side extensions (it may be here so I can look if you absolutely need it) It expands up to 6’ and is nearly impossible for a kid to escape.
Quick reference picture:
I am in Lancaster so come get this out of my way.
7l6/S48/O610
Mike