where can i find a shock lowering kit for a 05 trx300ex and a extended swingarm for it??

 

Why do you want to lower the shocks? I have widened the front end with 400ex a arms..then used an adaptor kit to put 400ex shocks on the front, and used a 2001 Raptor 660 shock on the rear with no mods. I have heard you can use a 350X swingarm, you just have to shim out one side with washers to make it fit. Otherwise, you can check aftermarket sources for the swingarm, not cheap, or look on eBay for one.