That's a nice looking car! I'm glad to see there are members here who are interested in getting under the hood and elsewhere, not afraid to fix the little things and maintain a car with a few miles on it.
I almost hate suggest such a product for a lexus but those small chips will go away temporarily with some Black Colorcote sealer polish. Its one of those color "waxes". I had an Audi with similar sanded road damage from the preious owner heading up the mountains to ski all the time, the front of the hood was speckled. Waxing the car will then leave the specks white. Anyway, while your getting around to addressing it properly with new paint, this would bring back a solid black appearance.
if you want to look for a replacement seat, www.car-part.com is the best nationwide search I know.
BTW - my first lexus, a 1992 LS400 w/107K is on a carrier coming up from Florida right now. Due to arrive on Sat. It is Dark Walnut Pearl Metallic of which I have not been able to find a picture of anywhere. I was lucky enough to buy fron original owner in Tampa with all service at the local lexus dealership.