Fuel injector lines

Hello guys ran in to a bit of a issue with my golf, and one of my fuel lines has a hole in it and is leaking, now I'm just wondering would mine be the m12 THREAD or the m10 THREAD, it's a 1982 1.6 GTI tin top on a Y reg, I have been offered lines from 1982 1.6 GTI 1982 cab on a X reg, now would these be the ones for my car also another  issue is are these hard to replace ans is there any issue that I could be faced with and best way to get the line off and replace all help appriciated in advance and also if anyone has any fuel lines about that they don't need let me know to many thanks

Hello guys is it normal for the injector to swivel as it not tightening and swivelling I tried pulling but doesn't come out I then had to hold it with a 12mm and undo the line to it with a 14mm just wna make sure it's normal for it to swivel or is it damaged all the others seem the same to thanks in advance

Yes the injectors don't screw into the head, they are held in by a couple of rubber seals, these seals go hard over time and the injectors are then difficult to pull out.
You do have to pull hard or even better make/get something to lever them out but make use they come out straight or you can damage them.
If you are just wanting to replace the fuel line you need to hold them still with 1 spanner and undo the fuel line with another, crows feet spanner are better but if you don't have any go carefully as you don't want the round them off.

picture of injector, I guess you have this type if you don't have a air hose going between cylinders 3 and 4, this type only has 1 rubber seal later injectors have 2 seals.

http://www.classic-vw.co.uk/fuel-injector-k-jet-m12-thread-bosch-mk1mk2-golf-jetta-caddy-scirocco-t25-15661-p.asp

Thanks Mark