Bumper Support Rail Bolt – 8K0 805 399 A
Bumper Support Rail Bolt for Audi A4 (B8). OE number 8K0 805 399 A. Main group 805 sub-group 399. Revision index A. Group 805, body front hardware.
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Technical specifications
| Part Number | 8K0 805 399 A |
| SKU | AUD-8K0805399A |
| Brand | |
| Category | Clips & Fasteners |
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Customer reviews
Verified feedback from Audi owners and independent workshops.
4.1
8 reviews
Oscar Novotny
July 24, 2026
Saved a trip to the dealer
My RS4 B7 needed this doing at 146k miles. Proper grade steel rather than the soft plated stuff that rounds off. Torqued to the manual figure with no sign of stretch. Result is it came in cheaper than the dealer wanted for the same specification.
Rebecca Rahman
December 18, 2025
Right bolts, count was short
Replacement for my 2010 A5 8T 3.0 TDI V6. I replaced the whole set rather than reuse stretch bolts, as you should. Proper grade steel rather than the soft plated stuff that rounds off. On balance no corrosion on them after a winter of road salt. Worth buying, just go in with your eyes open.
Talia Kaur
November 7, 2025
Good hardware, slow to arrive
Cross-referenced the OE number against my 2007 A4 B7 before ordering. I replaced the whole set rather than reuse stretch bolts, as you should. Proper grade steel rather than the soft plated stuff that rounds off. On balance everything torqued down evenly with nothing binding. Fine for the money, with that one caveat.
Jonas Novotny
September 4, 2025
Proper OE spec
Second one of these I have bought, this time for the Q7 4M. Proper grade steel rather than the soft plated stuff that rounds off. I replaced the whole set rather than reuse stretch bolts, as you should. Result is everything torqued down evenly with nothing binding.
Lena Ibrahim
September 3, 2025
Correct thread, correct grade
Bought for a 2012 A7 4G. Thread pitch and length are spot on against the old hardware. Torqued to the manual figure with no sign of stretch. Result is no corrosion on them after a winter of road salt.
Rajesh Ferreira
August 7, 2025
Exactly the right hardware
Fitted to my 2008 TT 8J. I replaced the whole set rather than reuse stretch bolts, as you should. Proper grade steel rather than the soft plated stuff that rounds off. Result is everything torqued down evenly with nothing binding. Delivery was quick too.
Hannah Whitfield
May 30, 2025
Right first time
Bought for a 2008 A6 C6. I replaced the whole set rather than reuse stretch bolts, as you should. Proper grade steel rather than the soft plated stuff that rounds off. Result is everything torqued down evenly with nothing binding. Delivery was quick too.
Patrick Delgado
April 16, 2025
Thread pitch was wrong
Replacement for my 2019 S3 8V 2.0 TDI. The thread pitch did not match my originals and I had to source them elsewhere. They threaded in cleanly by hand before I put a socket anywhere near them. Disappointing for the price.