I saw a 260SE advertised for sale the other day. It must have been a "grey import" as they were never sold here. The smallest engined late W126 (update) sold here was the 300SE. The 260 has the 2.6 litre rather than 3 litre version of the M103. In the earlier W126 we did get the 280SE with the older M110 six cylinder.

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.