Gravel or not, there are some parts that are on most of my bikes (depending on the compatibility)
1. Uno stem
2. Elita One seatpost
3. Lightweight cassettes from Wuzei, Sunshine etc (not the super light colorful ones)
4. Cooma brake pads
5. Heppe gold shift cables
6. Fish bone cable housing
Apart from these, Zniino handlebars which I have on 3 bikes and Elitewheels wheelsets. All my bikes are also running KMC chains from AliExpress.