I've found the balancer readily available, it's the 250 OEM pulley I can't find. It did come off the balancer, with three bolts and a puller.
Thanks though
Well, the ones I've seen, the grooves are part of the damper.
Anything from this site look familiar?
http://www.damperdoctor.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=DD&Category_Code=CHE