Need Recommendations for Older ThinkPad to Run Nissan Consult Program

I’m on the hunt for an older ThinkPad to run a specific program to read my older car's ECU. The program is an emulated scan tool of Nissan’s Consult software. My previous HP laptop handled it fine, but since upgrading a couple years ago to a T590 with Windows 10 Pro x64, I’ve hit a snag. The program runs but doesn't communicate with the ECU.

From what I’ve gathered, I think i should be using a laptop with an x86 instruction set (or maybe x86_64? This instruction set stuff is still a bit confusing). Ideally, I need something that can run or already has Windows 95, 98, XP, or 7. I’ve seen models ranging from T40s to X230s, but most seem to have been updated to newer OS versions.

I’m not afraid to go super old, as this laptop will only be used to run this program and needs a USB port. The cheaper, the better—I’d like to spend around $100. Is it still possible to install older Windows OS's, given that Microsoft has stopped offering them? What specific ThinkPad models should I focus on to meet my needs? Also, where should I look besides eBay and Marketplace? Any advice or guidance would be greatly appreciated.

TL;DR: Want an older ThinkPad for a Nissan Consult program that i think requires an x86 instruction set and runs Windows 95, 98, XP, or 7. Not afraid to go super old, needs a USB port, and budget is around $100. Which models should I look for, and where can I find them?