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I plan to replace my run-flats with regular tires, so I went to the local junkyard and found a pristine condition spare tire (part number 1644000002), jack, lug wrench, and short lug bolts, and got the whole kit for $17 (sweet!) off a late-2000s ML-class. The spare is 18" with a 155/90/18 tire (diameter according to tire size calculator is 29" which matches the GLC43 stock tires).
Upon test-fitting, the wheel did NOT clear the front AMG brake caliper (it rubbed along the corners). To solve this, I purchased a 20mm spacer (ebay link: https://www.ebay.com/itm/192483487611 "2X 20MM HUBCENTRIC WHEEL SPACERS ¦ 5X112 ¦ 66.6 CB ¦ 14X1.5 Fits Mercedes Audi" - pic below). After receiving the spacer, I test fitted again and now it clears with a few mm to spare - success.
A few things to note:
When mounting on the front with the spacer, I used the original (stock) lug bolts. Mounting on the rear without spacer will require the short lug bolts that were part of the kit I pulled from the trunk of the ML.
The spare fits in the hatch under the trunk lid, but you have to put it upside-down (yellow labels facing down). The hatch lid closes without any extra pressure
Those are not the ones I bought (mine were bolt through, these are bolt-on and leave you with studs), although my guess is it will work, probably with the short lug bolts but I can't tell.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
