I'm still fairly new to my X5 so I'll pick your brains guys if you don't mind.

Dealer genuine is twice as much and I never had any issues with Contitech, Dayco, Gates or Goodyear.

Trouble is that 3 other list 1030 size and OEM Contitech lists 1023 size.

Contitech 1023 is only $8 at AutohausAZ which is the best deal.

Which size is correct?

Thanks.

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2010 BMW M6 * Black Saphire Metallic * Full Black Merino Leather
2019 BMW X3 M40i * Alpine White * Mocha Leather