this one might be the gt32 one disco is reffering to, made by garrett.
http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=ATP-HSG-009&Category_Code=GTH
these ones however are definately not made by garrett. they have atp cast into the housing so i assume its made by them.
http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=ATP-HSG-063&Category_Code=GTH
these ones here i'm not sure about, it says its a garrett casting?
http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=ATP-HSG-078&Category_Code=GTH
http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=ATP-HSG-080&Category_Code=GTH