There's enough room to work with the right tool and set-up, dimensions aren't <2-4 thou critical either. Looks like you'll need a spacer to account for extra length also...

Would like to know what they come off just as a matter of interest as usually gc=gd arms have same mounting dimensions.

Be at workshop tomorrow pm me your number if you want to give it a go.

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MY99 WRX EJ2.35L 720whp 9.48@147mph
https://youtu.be/c_lYEG0_Dyo