Posted for "Bryan J. Burr" <bjburr@mwheli.com>:

 I purchased a kit that was designed for the IVP from Skandia.  However,
 for the price paid, the weight increase, and the small amount of noise
 reduction, my recommendation is to put the money towards a pair (or 4
 each) Bose X noise cancelling headsets.  Problem solved.
 
 But for a reference try www.skandiainc.com
 
 Bryan
 N132BB