http://www.baymfg.com/
I asked them about Suzuki extension about 2 years ago and they said something like the kits would void the warranty etc . . . so they weren't going to make them for Suzuki.
Bite the bullet and swap it out for $1300. You might ask them if they have a 25" 150 Suzuki too??? There is usually $1000 difference in price b/w the 150 vs the 175. Those extension kits are $600+ anyway. 20" on a bracket might work, but the powerhead will be close to the water coming off a plane.