The revised facelift for the Cup 250 was for the 17.5 model year which included the revised front clam and exposed gearshift.
The 17.5 model year came with the revised smaller aero package but there was never an option for the big aero. However, I think I am right that you can retrofit the big aero, but it certainly will not be cheap.
https://parts.lotuscars.com/a/Lotus_2018_Elise-2ZR---SC-S3---S-Cup220-Cup250-Cup260-Cup/_51505_9107829/Bumpers--Valences-Spoilers-amp-Aerofoils/Elise_CUP_1023.html