NLA is 'No Longer Available'. Sadly its becoming a common occurrence for D2-specific parts like hoses, trim etc. Even the little plastic arm for the headlight levelling now too - luckily yours is still serviceable.
Goran's car is a LHD manual, so if its leaking gear oil from the cooler lines there's a 50/50 chance the hose which is leaking is not available to buy any more. Being a manual, there aren't any secondhand either like there are for the autos. That would be a problem, were I not doing a RHD manual conversion in October, however since those hoses aren't available I will be developing an alternative solution