disco 300 tdi arches

hey everyone,
stupid question if anyone can help it would be great, got a 300 tdi on a 97 plate, was thinking about banging on a set of plastic arches to hide the nasties til i can afford to get them redone @ the spray yard, so i was thinking of getting some td5 arches because they look like they will roughly match up ??? has anyone tried and succeeded or can someone steer me in the right direction
cheers
del!

to answer my own question, been down to scrap yard yesterday and borrowed a set for one side, the fronts are slightly too long but would probably fit with cutting the arch to match, and the rears almost match up and wouldn't take to much to fit either ! but the local scappy quoted £80 so sod that i'll get proper ones that will fit to save the agro of cutting metal !