I have used this rad on my Thunderace which runs hot with no problems. I don't think you will get much smaller, but if you are concerned about heat, use a YZF750 rad. Make sure it is the straight one and not the curved one like the Ace. This has two fans as opposed to the one fan on the FZR rad.
Just looked at the Ebay listing and as FZR engines usually run quite hot I would not trust that size rad. That is just my opinion though.
I am running a YZF750 rad now and all of the hoses come out the back, but all the wiring for the temp switch, temp sender etc still come out of the front. I have yet to see a usable rad that has all of this coming out the back!!!
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