I thought this might be helpful but often times it's hard to search for terms on Yahoo Japan without knowing the right Kanji.
For example take the word "seat" (maybe you're looking for new car seats) and you use Google translate.
Google Translate says "座席" and you'll search for it but it's not really the common way of describing it (you may find a few items but you're missing most of them).
What I do is work backwards and noticed when translating the titles that came up for "座席" that "シート" was the most common term used and is a direct translation to seat.
So the idea of this thread is to have it all ready to copy and paste to make searching Yahoo Japan for things like suspension, coils, fuel pumps etc.. easier for English speakers. I don't have time to build this list anymore but hope others will contribute:
Seat シート
Coilovers 車高調 (thanks to Slowboi)
テールランプ tail lamp (or rear tail light)
left 左
right 右
headlight ヘッドライト