Hey mate its simple enough just to repalce or fix the carts but it al really depends on what you are using the boat for eg.
Racing= I would sugest the new cross beems because they are in built and just plane better, this also go for crusing. Can be expensive but worth all of it.
For Fun with family= just go for a basic and cheep method
For scary fun= Just make sure you buy a brand which can hold enough presure for what you are going to do. Mid market
in terms of buying them you can go to your hobie dealer or go to harken or ronstant etc, any of them will give you a hand to get or make one. Well have fun.


Jules