This table from the Boxster Owner's Manual (not sure what year) may help in picking a spacer size. Since 10 inch rears for a Boxster have a 47mm offset and your 997 rear wheels have a 58mm offset, a 10 or 11mm spacer may work on the rear. And on the front, the 8 inch Boxster wheel has a 50mm offset and the 997 wheels have a 57mm offset, so maybe a 7mm spacer. You will also need to change your lug bolts to longer ones to account for the spacers. They might also fit without spacers, but you would have to mount tires and check clearances. The handbrake cables may also need to be ziptied away from the tires.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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