Hi and welcome to Ninjette!
You can get silicone hoses off eBay, Summit Racing, Pegasus Racing, mishimoto.com, siliconehose.com, etc. Just measure yours and match up with something off-the-shelf.
However, note that silicone hoses are 15x more permeable to hot coolant than EPDM rubber. Coolant will "steam" itself through silicone hose and your radiator will run low. Roughly 1/2 of cooling system will seep through silicone hoses in 1-month. That's also why silicone hose cannot be used for gasoline or oil.