TP trampoline enclosures, also known as surrounds are available for all pre 2010 round TP Trampolines. You need to know the overall diameter of your trampoline, and how many pairs of legs it has.
Please note that TP changed their trampoline specification in 2006, so the number of legs changed on the 12ft and 14ft trampolines. Some will have 4 sets of legs whilst others will have 6 sets. This will determine how many upright poles there are on the enclosure.