I went ahead and order the following from ECS Tuning.

- Conical Seat 14x1.25x43mm Wheel Bolt - Priced Each ES#263932
- TRAK+ Hub Adapter - 15mm ES#1899557

Hopefully - the 43mm length lug bolt is sufficient enough with the 15mm spacers for my X6. I'll provide feedback once I receive it and put the wheel on the X5. Thanks everyone for your help.

Kiet

Kiet,

Did you complete this installation? Are you satisfied? Any issues, vibration? How's the look? Pics?

Thanks!

I never went through with this. I was quite nervous with the fact that nobody seem to have the right length bolt (45mm) for the 15mm spacers. I ended cancelling my order and sold the X6 wheels.

Kiet

Just for future reference, it should be noted that these TRAK+ Hub Adapter are NOT designed for the E70 X5 and would require some machine work and compromises if you want to use them.

They come with 12mm bolts, with low-profile heads, for connecting to the hub. The adapter also has 12mm holes for connecting to the wheels.

These will not work as-is for the E70 X5 as that uses 14mm bolts with regular heads.

The only way that I see that you could these adapters is:
1. to buy an additional set of 10 x 14mm bolts
2. grind down the heads of the these 14mm bolts so they don't jut out from the hub adapter. Attach hub adapter to hub.
3. attach the wheel to the adapter using the supplied 12mm low-profile head bolts (I don't know if this is potentially a fit problem for the wheel -- probably not).

Can you imagine trying to explain to a wheel/tire shop how to install/remove these adapters every 6 months though??? I'd be stuck doing my winter and summer wheels changes for the rest of my time with this X5...

So I'm back to exploring the wheel boring option... Otherwise, I'm going to sell two used two used X6 rear wheels and buy another two for X5 :(