Hi Pipster,
I've recently just bought a new T38 IE3 and am currently getting it ready for the season. This forum has proven to be quite a helpful resource.
Another option for you would be as suggested by forum user Mattster below using the german Suprod wheels:
https://www.rib.net/forum/f50/honwav...tml#post841170
It seems a 10mm spacer is needed to mount on the T38 as the air deck protrudes out the back of the transom.
Mattster has also recommended replacing the supplied 200mm PU wheels with 260mm pneumatic wheels. I bought some last week and the
german shop selling these kindly offered to replace the wheels at no extra cost.
Seems like this setup works well for him and means the wheels are tucked in while underway.