Need info on these parts..
 

Hi,

I need #s 18, 25, 26 parts in this pic of exhaust. I am not sure of 25, but for sure I am not having 18, 26. So, I am assuming that i am not having 25. The price for 25 is $50, so I am wondering if anyone is having a spare or one from a parts car. I would also like to know if there are any alternates for these parts and from where I can get them?

thanks,
-Pavan.