Here's a double dog and roller kit. Looks like the ones in the pic above.
$43.00 shipped
STIHL P/N 1135-650-7750
http://www.ebay.com/itm/STIHL-DUAL-...464?pt=LH_DefaultDomain_0&hash=item20d04b1ad0
I'll pass for $43. Don't need it that bad. Thanks for the information though.