Benjy,
One thing you might want to check is that the listing is for "LOTUS EUROPA S2 70-75".
Remember that Type 46 and 54's have the narrow springs and these items may only fit Type 65's . . and Lotus ceased production of the S2 long before 1975 as Kendo points out.
Lastly, while the tardy communications is certainly a concern, I'd be put off by the lack of spring rate options while they're happily offering 15 different spring colours!
This, to me, speaks to the 'bling' aspect as taking precedence.