mk2 driver rear wheel cylinders

[hobbiniho]

right iv been to my local vw garage two weeks ago and got them to order me a new wheel cylinder and rear axle pivoting bolt (the one that goes through the bush) adn went to collect today and it turns out that they havent even ordered it because there system does not recognise my vin number, i was wondering if any body knows the part number for these parts??? 

[hobbiniho]

right well iv just had a look and i kept the bag the bolt came in luckily 

n 903 544 01 for the bolt
n903 237 04 for the nut for it

so i just need the part number for the wheel cylinder on a 1990 (h) golf 1.6 driver