Ian I owned a 360 18mths ago and used it with a 2001 Mariner 15 short shaft 2-stroke. I had two different sets of transom wheels fitted, both the type you remove as I don't like flip-up types.
From having four different inflatables and four different short shaft outboards over the same period I can confirm they are all slightly different in their transom heights and shaft lengths. So getting it right is crucial hence I guess your questions.
I found it impossible to judge which transom wheels would suit from looking at a photo and would not want to be trusting dimensions given to you even in good faith. Looking at your actual boat's transom is really the only answer or looking at an identical one in the flesh and taking your own dimensions. Note there have been some changes to the 360 over the last few years and this may or may not affect the transom if you plan this job based on any other boat than your own.
Surely you could wait until you can get your own boat out?
If you Google transom wheel images you'll see that many sets only just get the skeg off the ground with the outboard in the running position, if the ground/slip is bumpy you may still catch the skeg. Some wheels fit such that the skeg would drag all the time. You need to make sure you get wheels with the longest legs to get the skeg safely in the air.
But I'd ask why you don't just lift the outboard a bit? I put mine into the shallow running position when the wheels are on and that's enough to lift the skeg well clear of damage so we can wheel the outfit over very uneven ground. You could even pull the outboard right up surely?
There is another aspect you need to think of. Some transom wheel sets are designed for the top mount to go in the existing hole in the Zodiac transom. I had a £60 set from an online supplier for the 360 and when using the existing top hole the tyres were closer to the bottom of the boat than I liked.
After the first launch/retrive I was horrified to see the extra weight of kit we put in before trolleying to launch, and springy nature of the air floor as it's wheeled over bumps, meant that the tyres impregnated with small bits of grit from the car park had worn small marks in the bottom fabric. Over a few more launches I'd have been looking at patching it.
The last thing I'd say is be very wary of the quality of the frequently unbranded ones mostly about online. Some are OK but others have very thin walled tubing with poorly sized holes in the nylon wheels such that they are hard to spin right from new, add in a bit of sand and they virtually seize.
Hope that all helps you think about it a bit.
Scroll down this thread to see my 360 with its fairly tall genuine Zodiac transom wheels, and the outboard almost touching the ground...
Zodiac Fastroller 360 Acti-V mini-review