Windscreen wipers?

How easy is it to convert a single wiper back to conventional wipers?
I've seen a possible buy, but it has a single wiper and I don't like it.
Would it mean bodywork replacement?

Cheers

i guess it depends on if the hole for the wiper stud at the base of the windscreen has been welded/smoothed over. if it is there its easy to swap back.
i swapped back to the two wiper setup on my caddy without any problems, i just used an original wiper mechanism bolted onto my wiper motor, it takes a little bit of fettling to get their positioning correct.