If not OC'ing...I think you can use pretty much any that would work on socket7 or socket 370. Since mostly new equipment does NOT use socket370 anymore most "chain" retailers don't carry HSFs for them. Check with any "Mom&Pop" type computer store at any strip mall in any town and you will find old HSFs probably for a couple bucks.
Or you can order some online but with cost plus shipping you will pay quite a bit.
There are *almost* no bad BP6s. There are mostly bad caps.
No BP6s remaining
ViaCPU laptop with Vista.(Works great after bumping ram to 2Gig)