107 owner...You can find front and rear bumpers at salvage yard for $1600 plus shipping.Then the 3 lower valence panels,on rear,may need paint match to your base color($200?).The best place for them,IMHO,is any euro SLC since the SLC's don't hold value too well.Look for a part out on an SLC and you may pick them up for $500 or so.That's what I did.

It was a little trouble to pull off...but they look great.

Best Regards,ch7ckc
1987 560 SL