There are THREE different types of stock Liftgate/Trunk Support Assembly (shocks) available for the 7th gen Toyota Celica.
A) WITHOUT WING economy/weakest.
These are the stock shocks used with Celica sold without a wing.
B) WITH WING Standard.
If you have the stock Celica wing, and no rear wiper. These are the most common on the GT with wings. Most aftermarket shocks use the same gas pressure as these. They should last you for about 5 to 10 years in standard weather conditions, and then they will show their age.
C) WITH WING & WITH REAR WIPER luxury/strongest.
These are the most common on the GT-S with wings and wiper assembly. This is also the set that comes standard when you purchase the Action Package (aka TRD) Wing.
I recommend these (C) if you live in very cold / very hot changing weather such as Las Vegas / Montreal.
I also recommend these (C) if you have a lesser variation and they are failing.
There is no fun in grabbing something from inside your trunk, only to have it slowly creep down on to the top of your head, or worse, not stay up. A set of weak/failing trunk lifts make it difficult to access your trunk storage.
--
Genuine Toyota prices are about $90 - $150 USD, per each side.
Aftermarket prices start at $20 USD and go up, per each side.