I can tell you that the frame side for both the 6 and 8 cyl are different for the pre 76 as it is for the post 76. They look the same at a quick glance, but the bolt holes are different for the different frames. Look for the 76 on CJ v8 style.
What you read doesn't make sense at all, unless you're referring to the rubber cushions for the CJ with a V8, which was only produced from '72-79 (though some '80 models did have a V8). A website won't list parts for an engine in years where the factory didn't use it.
I think the reason they say that on the web sites is because they are trying to match a factory application, and the V8 was only available a certain number of years, and 1984 wasn't one of them (although I thought that '80 or '81 was the last year...not '79). Therefore, if you bought V8 mounts for your '84 CJ, they wouldn't fit because they are assuming it's stock, and you would either have a 4cyl or 6cyl under the hood.
That being said, motor mounts that fit a V8 will work in the later years. I have a set of M.O.R.E. bombproof mounts, and their application guide says that it fits '72-'86 CJs.
Like others have said, you can use the mounts from older cj's that had factory installed v-8s. They will fit on your cj-7. There have been a good number of posts covering this, and pictures as well. Have faith my friend. I bought a 360 that came from a grand wagoneer (88 model) and got the mounts that the engine attached to. I ended up buying some mounts from an old cj with a factory 304 (now 402 installed) to fit in the cj-7.
I just bought a CJ7 frame (believe '79) that had V8 mounts on it. I just don't know what V8. I can post up some pics and maybe someone can ID them. If it is what you need you can have them for shipping.