Speedyz

Hi all, I am a total newbie and hope that you all can help me out. I recently got a 98 LS400 and love it alot however I am now having worries on how long the car can last. The car that has been maintained poorly and defintely require replacing quite a number of stuff( the last time the timing belt was change was on 2005! that is almost 9 years AGO!! Crazy! It is a ticking time bomb waiting to explode!) Is there any other way to get OEM Lexus LS400 parts besides going to the dealership? Do I have to use OEM parts? I want to use OEM parts as I read that it is more reliable. Where can I find parts for my Lexus? I really need some help here. What are the things that can be obtained from the US version of the LS400(interchangeable) like engine stuff and what are not? I think that engine items are all virtually interchangeable with the US model but I am not sure what parts are and what are not. And if there are essential parts that are not replaceble, what am I to do? How do I get my independent mechanic to be able to do repairs and maintenance? Is there a servicing manual that can be bought? Is there a UK version manual for the 98 LS400? I have been searching through the entire forum for answers. Appreciate the kind help of such a supportive community. Thanks so much!