It's important to work out what you really need. They are either 20" (L) or 25" (XL) or 30" (XXL). 

Good luck with your search. There is a dealer in Wangara that regularly has used 4 strokes for sale. Maybe contact these types guys and let them know what you're looking for as something they repower might have what you need.

Saltwater series yammy new gauges new oil tank good nick he upgraded to Suzuki 4 stroke. Hrs I think around 600 or high 5s. Also my little Andy thinking of getting brand new Suzy soon also. 2 options 1 already off. Pretty sure mate only wants 2.500 for his saltwater . Can find out if you want

It’s of a voyager. Pretty sure you may need 20 inch one. Could be wrong. My Luke’s Viking has long leg ( but we built up transom) stop waves coming in back. Little Andy’s is 20 inch on on his swifty no build up. My swifty has 25 inch. Higher transom . Pretty sure dominator needs 20.

 not too sure on inches only going on what the mechanic told us . it needs a long. 

Check how long in inches with your mechanic , be best way to go

 Long is 20 inches. Xl is 25 inches. 

Go. Dodgy sounds on the money. I’m unsure all changed from . Short medium , long

 at least someone knows. i cant even buy a boat thats got a motor that works properly. 

 Will be hard going finding a good second hand 20" long leg. Not alot around as yourve found out. Easier option would be to lenghten your transon to fit a XL leg.

 I fitted an XL to mine, F115a Yamaha. Had to have an alumuminium bracket made up to extend transom height. It would fly with one of those Saltwater series 130 Yamaha 2 strokes. As others have said, getting an L is pretty hard in newer motors, extend transom up to XL and you'll have plenty of choice.

At bullet boats done my boys . Doesn’t cost that much. Made out of thick ally. Trust me makes huge difference while drifting in seas. Stops waves comeing over the back. But Luke’s got 130 Honda ( heavy motor). Made his sit lower than most.

 def worth looking at extending the transome. the mechanic said his cost him about 1k to be done. 

Zoom, whats this jacking plate your talking about. would they hold a larger motor . 

just more stuff to spend $ on.

 if i go with extending the back my mechanic has a motor for us thats one of his own he would sell us . 

 Mandurah outboards had a couple in there a few weeks ago. Can't remember the exact hp. They did catch my eye though

Did you see this one that popped up on gumtree?

20" 2009 90hp Yamaha.

www.gumtree.com.au/s-ad/osborne-park/boat-accessories-parts/90hp-yamaha-2009-model-/1162929674

 A jacking plate is used to mount outboards to when you want to be able to go up or down a couple of holes without having to remove the motor every time. Some people use them to make the difference between 20" and 25" transoms. Every time someone mentions something that might help you, you seem to complain about the cost. There is no free solution to your issue of too short a transom for the readily available motors. 

A transom height extension using ply and fibreglass is not a squillion dollar project if you can do a lot of the work yourself.

Bolting a thick ally plate while ugly can do the same thing as well.

 thanks for all help. 

were going to extend the transome which goes in mid next week. then to the mechanic in a couple of weeks for the donk which is the mechanics own that he has taken off his own boat a while ago. i know its a 150 two stroke but cant remember brand . will be on the wateer in about a month. fingers crossed

 Your buying a motor you dont even know the brand of. How do you know if your getting a good deal. Does it come with a warrenty. Have you heard it running. Do you trust this mechanic? For your sake l hope your not being burnt a second time.