Hey, those square ones look the same as the ones on my brother's Subaru WRX, he replaced them when he put a 4 inch dp on so it looks like I have some "new" spare parts.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k