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I was happy with Willcox. I bought the whole package but you can get just one or two pieces if you only have a small issue.
Job was not hard. Take your time and get the old stuff off and clean off any left-over goo. For installation I did not glue everything, just a few places.
Also, allow time after the new stuff is on, for it to seat and settle tight. Right after I did the job I had leaks, in one case worse than before. After some time and miles it's a big improvement over before I did the work.
There are other threads on here with more details, try a search and see what you come up with.