1991 and over 270,000 km runs like a one

Hello guys, I wanted to turn to you. I’m still driving a Sierra Bj. 1991 and over 270,000 km on the clock. I almost wanted to sell it now but I’ll probably keep it for a while. At least until the next buffet date in mid 2006. Then a bigger reperture is due. Supposedly, the frame is rusted through and that’s what you have to do. Now the following reperatures stand for me: New summer tires (205/50/R15) and new discs and coverings in front. Actually also wanted a new lede. Unfortunately, the dealer told me he couldn’t get it. Do you have any help for me? Where can I get access to such parts.? Did I also want to retrofit something for boxing and maybe repair the wooden switch again. Had a catalog of Shui or something before. You could get almost everything there. Is there still the possibility to get such things? Then still the most important question. The car was changed by my father at the time with shortened feathers. But that makes me have a crazy fall and the tire wear is corresponding. I need a set per year for my annual drive performance. Can you change that cost-effectively? Would I be happy to get a few tips from you. Greetings Tom