yamaha suspension

Planning to do the rear folding seat on my 2011 gas car. It was recommended that I put heavy duty springs. My question is, are the springs on amazon/ebay the same as the ones “jakes” on the cart sites for almost double the price? Or is it worth it to spend the extra cash?

Hi all, I just purchased a Yamaha G1, at least I think it's a G1, that's what the previous owner told me it was. I need to check serial numbers to find out for sure. I got a great deal so I bought the cart without a second thought. However, the more I drove it, the more the front end is sagging...