yup i know what these are
Do you still have the cardboard sleeve and polystyrene packaging for them? This will add to the overall value.
Obviously depending on who's after them when you sell them will depend on the price (it can go crazy high sometimes as theyre rare), but going on the 3 youve got there
The puma you'll get around £30-50+ for (more valuable to someone collecting the set than the individual piece)
The capri upwards of £100, attractive as an individual piece
The Cobra £60+ in the UK but more attractive to the USA market where you should get £200-400
The RS models though, they start fights on auction sites and they go anywhere from £300-£500
not seen any for sale for a while though, google "Ford Calender Collection" hope this helps
...and yes i collect 1:18 models, but not fords though