Delivery to france is working out at £53 because of the weight, I will reduce the price and do the lot for £199 delivered to France if you are genuinely interested?
Not true, I found out the hard way when trying to install a 4.4 EK9 LSD into a standard S4C UK gearbox and the 4.4 EK9 ring gear would not mesh with the S4C countershaft
I then counted the teeth on both and discovered that the S4C has a 4.266 final drive ratio. Everyone thinks that the UK S4C has a 4.4 because they must have read it somewhere
Here is a link showing the exact differences in ratios and it shows the teeth count vs final drive ratio in the table at the bottom of the page
Your Y1 has a 4.266 FD so a 4.7FD set made specifically for your box from Mfactory for example would make a nice difference
If you want to use a DC2 4.78 FD you will need to fit the DC2 countershaft and the 1st gear to make it work
A gearset to suit your local circuit will make the best acceleration gains but they are usually not suited to long journeys due to the high revs with a 5 speed box