Hi guys - I'd be grateful for any advice on how to find a replacement coolant pipe for my 1985 1.6d CS. It's sprung a couple of tiny leaks in the 4 way 'octopus' pipe over the top of the block. Looking and asking around I believe the part is no longer available (068-121-101C). Do any of you know of any secret stashes or, failing that, any recommendations for a company that might be able to make one up?
Also,

If I need to top up the coolant, where should I fill it from - I assume the highest point would be radiator?
Ta v much - David