systdow666

audi sedan hazard switch triangle button snap clips are toward front
4B0941509C

audi tt mk1 hazard switch round button snap clips toward rear
8N0941509A

audi tt mk1 hazard switch round button revised sealed relays snap clips toward rear

8N0941509B

im aure there is a revised part number for the sedan switch

but as far as internals go besides a slightly longer led front badge stem ( has no effect on swapping housing and buttons) these are the the exact same part and with your old audi tt hazard switch housing and button can save you 30-50 dollars depending on your part cost just swapping the internals around