I’m sorry. “Roof rails”JDM Side rails? I'm confused by that terminology.
2002-2007 USDM WRX Wagon has 20mm bars front. Ebay or junkyard. That same wrx wagon has 17mm rear sway bars, but you can upgrade 1mm larger by grabbing an 18mm rear sway bar from a 1996-1999 Outback wagon. Ebay or junkyard again. If you want to go larger in the rear, ebay. I wouldn't go much past 20mm.
I'm seeing this P/N on some dealer parts sites for under $145, a little less courage to muster.Genuine Subaru Part Number: E3610SS100. 2000-2007 Subaru Impreza. Roof Rack Crossbar Kit is a direct fit for the following.www.ebay.com
Wondered if these would fit. Too chicken shit to order to see.