Here we are offering the cooler and the hoses as a set for two reasons.
1) Because the factory oil cooler is made of aluminum and the hose connectors being made of steel causing galvanic corrosion over the years making it nearly impossible to successfully reuse the cooler as the threads tend to get stripped and damaged. And taking much time trying to disconnect and if you use a torch as I have then for sure the aluminum threads are ruined.
2) The cooler has years of old dirty oil and potential harmful deposits that are nearly impossible to get all out. Therefore, being reintroduced back into the engine. So once you disconnect the cooler you can toss it and start out fresh with a new cooler and hoses with a three-year manufacturer's warranty. The factory hoses have a threaded mesh in it but ours has a metal mesh for added strength. And the best quality was used and made here in the States. I did not skimp by choosing inferior cheap materials to keep the cost down but rather chose top quality for the best everlasting cooling performance. So many things on the XJS that need service and replacement are those that you do not want to do again. You should not be concerned about this issue for several years if even then.