1992 sts rear suspension doesn´t fit
 

Hi, I have checked with amazon.com and monroe.com if the part # 71801 Monroe sens-a-trac rear suspension will fit my caddy STS 1992 4.9L, both websites said it will.
Now I´m in Guatemala, Central America with my car and the struts that I bought and shipped from the USA and they don´t fit. I have checked the internet and find some angry fellows that they said don´t fit, others by the other hand said they will fit! So I´m doing something wrong with the installation or I´m another dissapointed customer from amazon and monroe? The info they published in their web site is a scam!!!
Thanks