They were bought out by http://www.pro-werks.com/
I contacted them last week and they will sell some parts, but not the rack.
Good luck on finding parts, it looks like the D & R unit will interchange with it. But they will not sell a rack ether.

That's not true DNR has pinyon gears in stock they can sell now they won't have all the parts for 60 days as he's getting them manufactured however he does have complete racks He sells for $400 plus shipping call him they will send you one Monday 1-760-803-8702