Hi all. My MIL's 2016 Cherokee has the LF strut leaking out. It's 4x4 w 2.4 engine. One parts store quoted me the strut but says requires a retainer which he can't supply right now. He can supply the mount which includes the retainer for $105. That's almost as much as the $120 strut. 1, do I really need this retainer? The mount is quiet and smooth. 2, besides spring compressor and alignment what specialty tools will be needed. 3, should I just get the "quick strut"? Thanks for looking.