yep i didnt have a part no and went for a seat leon cupra r one its the nice one as well with chrome ring not like the new ones all black with just s in it
 
1MO 837 891 A thats the part no. on my invoice as well so it exists lol
 
well my mates ke4y im doing today....

went to get it cut at two timpsons in stoke on trent...

first one said he could do it for £3.45 but can't gurantee it...went to do it and the key kept slipping out of his worn machine....

2nd guy had same problem but said he could still have a go but be £10!!!!!!

Told them to stick it...

man is that guy on ebay still cutting them from pictures?? i can't find him!
 
Got my key cut today, split the key open and fitted the immob chip (Like a little glass pill).

When I opened the top half of the key, the old one just fell out :)

Good guide you have their Gaz, good mod I recommend.