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So the key information for this part is its M12 x 1.5 pitch x 120mm. Tough times call for tough measures. Could N90924103 be used instead? As far as I can see the only difference is it’s 130mm. It’s a subframe bolt, so will be torque to yield and have the strength characterises of the original bolt. Remove 10mm off end, clean thread, etc.

Thanks for clarifying, Gareth. I understand now that your earlier suggestion was specifically about Richard's replacement bolt rather than just any M12 × 1.5 bolt. I've contacted Spareto regarding the original part number to see if they can confirm the exact dimensions and availability. They also stock the longer N90924103 bolt that Richard found, so I'm waiting to hear back from them before deciding which route to take. Thanks again to everyone for the help and suggestions.

In the end John beggars can't be choosers. If the Spareto part is all that is available I would take a chance on it or go with Gareth's suggestion of a longer bolt with a nut. As long as you get the right clamping force between the two components you will meet the designed strength requirements.

No, not used it personally. According to LLL parts, it is a subframe bolt (item 4) in this diagram). However I see its used on suspension bolt too across VAG range. https://www.lllparts.co.uk/product/n90924103/bolt-hex-hd-with-pin-combi-n90924103 Anyway back to your dilemma. Have you tried https://spareto.com/products/volkswagen-ag-bolt/n90956803 Based in Estonia I think. Doesn't say they are out of stock so ypu might be in luck. Be aware you'll probably pay tax at post office, thanks to Brexit. Dealt with the same ordering BMW parts via Hubauer Shop (Germany).

Great and helpful find Richard. Buy an M12 x 1.5 nut and screw that on and leave it on, before cutting the bolt to size. Dress the cut end and remove the nut - that will aid thread cleaning. Regards, Gareth.