Query - rear suspension coil spring part number

[VolksPhil]

I've managed to break a coil spring on the wonderful flat smooth UK roads, so now need to replace them both. I can find a part to fit via Halfords but *******.co.uk is comin gup with cheaper parts (same make etc) but they seem to have a wider variety of options. How do I work out which is the correct spring (and mounting cups - top and bottom) for my vehicle? Mine is a 2013 B7 Bluemotion 140HP with sports suspension and factory fit tow bar. This is what ******* comes up with for me: https://www.*******.co.uk/car-parts/...00%5D%5B%5D=HA Halfords says these: Sachs Coil Spring 627447080 | Halfords UK

Thanks!

[Crasher]

What is the VIN and front or back?

[VolksPhil]

It's the rear near side I broke but I know I need to replace in pairs - VIN has been sent via PM.

[Crasher]

Spring 3C0 511 115 AS (1 x blue, 1 x lilac, 1 x orange) £183
Underlay upper 1K0 512 149 B £10.32
Spring support lower 1K0 512 297 D £10.32

Prices are VW UK retail inc. VAT.

There is no aftermarket spring listed, except the Eibach R23303, from anyone I trust.

[VolksPhil]

Cheers Crasher - very much appreciated!