Horn relay question

My horn has had on\off issued and figured out it was the relay in position K on my series1 fuse board but now cant find the right relay online to replace it.
The original relay thats broken, it's part number is 171937503 4 pin 12V40A.

I've found these two but not sure if they're correct:
http://www.vwsonline.co.uk/car_parts_bristol/vw/golf/golf1/electrical/relays/191-937-503.html
http://www.vwsonline.co.uk/car_parts_bristol/vw/golf/golf1/electrical/relays/431-951-253h-bq.html

If anyone could help that would be great.

Cheers Iain

As long as the pins match your own then either will do fine.