Sorry to hear that your honey has a sagging rear end. My honey of over 20 years has a slightly saggy rear end, but I love her dearly. You need to look beyond the physical.
Please....don't respond to this, I just couldn't resist.

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold