Based on this product's specifications, here are some alternatives and similar models
Trampoline spring BESK 9040010 for 4.27 m trampoline
Summary description:
Replacement trampoline spring BESK 9040010 designed for use with 4.27 m trampolines. This metal coil spring matches the specified model and length requirement for restoring bounce and tension of the jumping mat. Suitable for repairing worn or broken springs, maintaining trampoline safety and performance during regular outdoor or backyard use.