Posted for John Huft <aflyer@lazy8.net>:

 Thanks, Charles
 
 I have been buying my K&N filters from Martel Bros.
 
 http://www.martelbrothers.com/catalog/KampN-Universal-Filters-sp-20.html
 
 You can choose the filter that fits your application. I have been using the
2510 which is 3.5 inches long, and the valve adds another 3/4".
 
 John