Hello there

We have a 1992 Sierra Cosworth Sapphire and have a prob with it.
The driveshaft at the front left wheel pops out after driving 10meter. The previous owner says the driveshafts are aftermarket ones because originals are hard to get.
But I think they might be too short. Does anyone know what the length of the driveshafts should be?
The ones on this car measure 620millimeters (I think is 24.40inch??) from top to top! Can anyone confirm that?

Another question regarding, are the driveshafts on a sierra XR4 the same as the cosworth ones?
Best regards, Cédric