Spares to carry.

[Edweird]

I don't really carry parts around. I've got a few basic tools (including a feeler gauge), jump leads, a tow rope, a tow strap (the rope is better but I've used the strap for other things before) a coat, a waterproof, a towel, swimming shorts and a picnic blanket.

[donkeychomp]

[ScottieJ]

Tools, HT leads, a spare P/S-alt belt (both the same length), bulbs, water.

When I had points I would always carry a spare set of points and a condenser in the glove box with some feeler gauges and a screwdriver just in case

If I'm going away for the weekend I might take oils, a set of props, front shafts and CVs. No need to take spare diffs, they don't explode like land rover ones

[ROBBIE]

Stuff
As much as will go in the box. I dont like to carry bits loose, as things tend to hurt if you roll

[twiss]

I take my portable toolkit, a decent jack, sometimes axle stands, fuses, bolts, bits of wire...
I'd say convert to electronic ignition!!!