I found that 1st gen treps have the subframe bushings available from retailers as well as the dealership. I would order from partsamerica.com, you get free shipping over $50 and you can price match to anyone else online, like rockauto.com for example. Best customer service there, and if you dont want something, you can return it to a in-network local retailer.
For 2nd gen treps it seems these bushings are dealer only.
you need any help doing this replacement, just take a look at the thread I made regarding the replacement of mine. It all, it was a fun little morning project. Good luck