Would you maybe better off getting euro bumper's off of e-bay? I see them from time to time they do get snatched up quick. You will probably have to get a rear apron that goes under the rear bumper as well. There is actually three apron pieces, they bolt to the bumper one center and two end's. The front and rear bumper attach with four bolt's. I have had my euro's on and off they are relitively easy to attach or remove. Make sure you use plenty of penetrant when removing bumper bolt's on rear bumper's (close to fuel tank) I broke a nutsert in a rear bumper and had a heck of a time cutting off the bolt!
Good Luck Rayson
Here is what mine looks like with euro bumper's

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I love low mileage cars!
1972 350SL 23,000 miles
.......Sold...........
Now 1969 280SL