If you’re building your own kit from scratch this won’t be cheap to assemble so you’re best to fill it with things you’ve already got rather than buy new. If you go to the auto dismantler you can probably pick up bulbs and relays for cheap or free. Just remember to test used stuff before adding anything to the box.
I always like to hear what people carry around in their trunks. Here’s mine:
All that fits in a single plastic tote with room to spare. I also carry a set of basic tools (screwdrivers, wrenches and sockets, voltmeter, etc.) and a gas can. With a list that long you might think the car breaks down all the time but to be fair I’ve never been stranded (though sometimes I’ve chosen not to drive the car because of a drivability issue). I’ve made a lot of little adjustments on the road but never had to make a major repair.
For comparision, here’s what the Bentley manual recommends every e30 owner carry:
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