Yeah my friend got the CS one to fit he used the stock overflow hose for the stock radiator... I have a koyo radiator and the nipple on it is 5/16 and im pretty sure its bigger then the stock one, so thats the problem... if all else fails im gonna just get a new oem one. I dont wanna buy another one off ebay if it is used just because it might crack again soon id rather just start off with a new one even though thats a ton of money. For that same price of $134 i could get a CS one and have someone weld a new fitting.... I looked everywhere for some 1/4 inch tubing that would fit the CS tank and i ended up at some hot rodish auto parts store and they gave me some clear stuff it looked like air tubing for a fish tank so i decided to not trust that because id rather not worry about having a coolant leak from a hose that didnt look like it could handle much of a high temp...
There is however this one on ebay.....
http://cgi.ebay.com/ebaymotors...ZWDVW
But i dont know if i want to "test" something out on my car haha especially something that has to do with the cooling system... I mean the tank looks allright but still idk about if there could be any leaks around the fittings or anything like that..