[Elecraft] Collins Filters for the K3???

[wg6h at yahoo.com]

I just spotted an ad on QTH.com for a K3 with "the better collins filters".
 
Can this be true or just hype?  I am only aware of filters from Elecraft or direct from  Inrad.
 
I frankly would love to have Collins filters rather than the Inrads.  Anyone know about this?
 
Thanks & 73, 
Bill  - K6WLM
 
KX1
K2
K3/100