Aewsome advise thank you!First: high-five on the awesome deal!!
It's been awhile since I've sold on eBay. I used to do a fair bit there.
My recommendations are probably pretty obvious but I'll put them out there anyway.
Usually there's multiple categories that seem to be good fits for the item. Try to find if there are other parts of the same or similar and see what category they were listed in.
Take clear photos. Look up and include the specifications that were listed in the write ups for the part on other retail websites. Double check your spelling and numbers.
I like to charge a little more and offer free 3 day shipping. For a car part though, youymight let them pay for overnight in case they need it in a hurry. I always tried to clear 50% of retail price but that was just my personal rule of thumb.
I would recommend offering as buy it now, especially for something like a car part which probably won't generate a bidding war. You can also try a higher price but use the "Make an offer" feature. Luckily, you have several so you can sell one and use what you learn to try and make the remaining sales better.
Good luck! Let us know how it goes.