> If you know of a source for those square filters,
> let us know.  I haven't found any online or local.

They have been on factory backorder for a while, but we still have some left
at this time:

http://busdepot.com/details.jsp?partnumber=133133511

- Ron Salmon
  The Bus Depot, Inc.
  www.busdepot.com
  (215)  234-VWVW

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Toll-Free for Orders by PART # :  1-866-BUS-DEPOT