Not sure about later indicator stalks. The ones linked above are not the same as the earlier Morgan ones either. The early ones have no symbols on the stalks. Google MK3 Mini and you'll see. The Mini ones are shorter than the Transit ones but fit easily without needing a bend.

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"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10