I wouldn’t have the hassle of doing seals again. It’s a bit awkward changing it on the Disco as their are some Air Con pipes that get in the way, but it should be easy enough on a Defender. I think I bought mine direct from this seller, then sent them my old one on an exchange basis so I didn’t have to wait on them refurbishing mine.Laudable trying to have a go yourself but why would you if some grease monkey who builds these in his sleep is offering a repair service for the price of a decent bottle of red?