Haven't been able to find one for the year of my LS400. I've been to the junkyard and no luck. The tank seems to differ from some years. Anyway it seems like the threads to the coolant temp sensor (i assume that's what it is) are stripped. I can't get it to thread in all the way, aside from that the previous owner told me that the coolant tank had a small crack and the temps would start to raise after driving 10-20 mins. Didn't want to risk the car getting too hot so i've just let it sit until I can find the right coolant tank. If you have one that isn't cracked and in good condition let me know, thanks

 

I've got one out of a 94. It should be the exact same, but please verify. I'll do $60 shipped if your interested. Please shoot me a PM as I am not on here often.