You'd need to have the car there or take some samples (nothing Subaru specific)but I found what I needed by him coming to my place & trying different types but it looks like he has the bumper clips....I got front inner guard & side skirt clips by trial & error, he's happy to let you open the packs & try them.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.