Finga, It wont just have the holes to fit a winch. It will have a rectangle line in the steel on the front, that when bashed with a hammer press's out and your rollers fit too. If its not a tjm winchbar. Its a pain to fit a winch too.
I take it that its a topmount winch?? If its any less than 9000lbs dont bother with it. As you will have to use a block and tackle and double it over to get any kind of performance, and transform your range from 30 metres to a measly 15 metres.
In regards to your number plate. You can put it below your winch. Or make a nifty little bracket thats hinged and hides your winch all together..