Found at RadioShack-
enercell 12VDC-2A Car Power Adapter Model #270-052
http://www.radioshack.com/product/in...lickid=prod_cs
Includes the "H" tip which works with the pe, (install with POSITIVE tip polarity, as per instructions).
The "H" tip is slighty longer than the OEM tip (perhaps 1/8") but works just fine.
Tested for a week now, over the road, with no issues. US$15.00.
Lawrence