Subaru Fitments Guide:

2001 or Earlier Impreza - GC8 

• Standard spec - 17x7.5 +45mm ~ +52mm offset
• Aggressive Spec - 17x8.5 +35mm ~ 17x9.0 +38mm offset
• Bolt Pattern: 5x100

2002 ~ 2007 Impreza WRX or 2.5i  (GDA)

• Standard Spec - 18x8.0 +45mm ~ +50mm
• Aggressive Spec - 18x9.0 +38mm ~ +30mm
• Bolt Pattern: 5x100

2005~2007 Impreza STI only

• Standard Spec - 18x8.5 +45mm ~ +50mm
• Aggressive Spec - 18x9.0 +38mm ~ +20mm
• Super Aggressive Spec - 18x10.0 +20mm ~ +36mm
• Bolt Pattern: 5x114.3

2008 ~ 2011 Impreza STI Only

• Standard Spec - 18x9.0 +45mm 
• Aggressive Spec - 18x10.0 +38mm
• Super Aggressive Spec - 18x10.5 +22mm
• Bolt Pattern: 5x114.3