73104129R had neither the centre map box, nor the engine cover struts, but had different light brown cloth inserts with the oatmeal trim.
74024259R had all three, the centre map box, the original Lotus engine cover struts, and the cloth inserts in the seats.
From registry photos, 73084019R and 73084021R have no struts or map boxes, 73104084R seems to have the original Lotus strut, 4088R seems to have the Lotus struts and the cloth trim, 73114159R has the Lotus struts and the cloth trim, 4206R has the original Lotus struts and the map box, 4227R has non original engine cover struts, 4214R has the Lotus struts, 4251R has the Lotus struts and the cloth inserts in the seats, 4255R has the Lotus struts, the map box, but has been re-trimmed in leather, 4279R has the glove box cover but the whole dashboard looks to be a different wood, 4299R has the Lotus struts and the glove box cover.
So it seems from about 73104084R, the Lotus production line fitted whatever they had lying around behind them, as normal !!!
Therefore Sherlock deduces changes happened around October 1973, and you got what they had lying around behind them on the production line.
To back that random specification up, the very last UK cars had US Federal bodyshells, e.g. my original car 75032429P.