Hello, Can anyone tell me the easiest why to change my air con rad on my 1995 Impreza Import?

If I undo the bolts on the top of the main rad will it push back enough to be able to pull the air con one out?

Dont really want to pull the main rad out as it's only just gone back it and that was done by a garage who deal with rad's all day.
They priced a new one at £135, Labour £80 and something else costing £60! I'd rather try a second hand one and fit it myself, then I'll only have to pay to have it filled then!

Thanks Claire