o id be making all 4 a project after seeing that ..
it is a very messy job . I cant speak of what you should or shouldnt buy but i would get the 4 boot kit ., if you clicked further on under info you would see you would get all new gaskets, new bolts , retaining clips .
You do these things so rarely and its so messy why not just do it right the first time.
to do a proper job of it you need to take the half shaft off , disasemble the cv joints and clean all the old grease out with a rag and then warm soapy water ( not solvents ) .
Then put it all back together with your new hardware . there are a ton of threads on this so take your time, get dirty and enjoy .. BTW wear clothes you are prepared to throw away after .. coz you will ...