@Kevbo…I think that is Gene Shalit’s hair. :) Or wait…I think I dated that guy! lol
Here is something that I think is close…take it to a hairdresser with a photo of Jerry and she can style it. I think you can work with this one (this is also the site that has the “official” whatever that means) Kramer wig.
Remember that wigs out of the package don’t look exactly how you might want them…so you find something that is close…and then take it to a stylist to do it up the way you want. This has the shorter hair with the longer hair in back.
http://www.mycostumewigs.com/ormuwig.html