I would also bring along a full set of belts and hoses and a water pump. Maybe it's overkill, but if you expect to keep the car or get another W123 you will eventually need them anyway.

I brought all that stuff on my short trip to Miami a few weeks ago in my W116. I didn't need any of it, but I almost did. I had forgotten to tighten the alternator lower bolt and it chewed up the belts pretty badly. I didn't notice it until we returned but we could have been stuck on the road in a strange place and lost a lot of time. I know you have the ability to do any of this stuff- just depends on your sense of adventure and tolerance for delay disruption and expen$e.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)