if you're using the aluminium rear A-arms then the wheels will not fit under the stock beetle rear wings.
8" rims are actually 9" wide, so even with the huge offset I think they will stick stick out & the inside of the rim will touch the spring plates.
You could always fit some slightly wider rear wings
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66 type1 cabrio, 2276 DTA FI, Brembos, Servo, IRS, Berg 5 Quaife etc
project in progress