What ever you do don't go to Nissan to get replacement hoses.
I went to get a replacement for the top and bottom radiator hoses, they wanted $69.00 for the top and $100+ for the bottom one..... mind you this is after the dude behind the counter told me he didn't even know what a skyline looked like
I just laughed in his face and said sure you don't.... and the price on the hoses WTF?
I can get silicon hoses for cheaper than that, walked out still laughing.
Anyway to cut a long story short Repco had exactly the same hoses ..... $15.00 for the top hose and $22.00 for the bottom hose.
Don't know about the heater hoses sorry.