As for the 7M vacuum hose size is 3mm (.118"). I am guessing the 1J is the same.
I have a few 1/8" (.125") installed on my supra and the 1/8" fit like ass, they are way too loose. They can easily "pop" off and need to be clamped down.
. . I thought that being within .010" would be close enough for the vac. hose, BUT again I was wrong. :nono:
I am still going to replace all of mine with 3mm when that time comes. I’m just not a fan of the "thick" silicone hose. I like the thinner OEM black hoses with the Japanese writing on it.