FFS; Why do RockAuto have 2 different caliper rebuild kits for VR4's?

[TUFFTR]

Just ordered my caliper rebuild kits for my brakes. perfect, arrived in 3 days from the USA! Fantastic. However they are HORRIBLY wrong. Now, I have stuffed up here as I should of taken off my caliper first.

However, I purchased these under the VR4 listings.
Now, this is what I ordered;
More Information for BECK/ARNLEY 0717888 (http://www.rockauto.com/catalog/moreinfo.php?pk=486260)
Thinking nothing of it....taking my pistons out of the caliper, realizing I need the rebuild kit listed BELOW it.
This one;
More Information for RAYBESTOS WK2114 (http://www.rockauto.com/catalog/moreinfo.php?pk=314383)

Why o WHY are there 2 different (totally different) parts listed? Now I'm $60 down the fucking shitter, which I really cant afford right now so I'm gonna have to see what rockauto can do. probably nothing really. But Now I'm stuck with $60 worth of useless crap.

So yes, why are there 2 very different part numbers?

[Alex3000gt]

Good question. Rock Auto is strange like that.

[STLVR4]

Sorry to hear that.

Do you have 1st gen TT brakes?

I would like to know because I also need to rebuild the front calipers and would need to know which kit to order..

[GTO Assassin]

Did you just order the 2nd Gen kit instead of the 1st Gen kit?

Scotty

[TUFFTR]

The pistons are the same size weather 1st gen or 2nd gen, so it doesn't matter really

But like I said, after taking apart my calipers (all of 10 minutes, holy shit that was easy) I could easily tell I had the wrong kit.

After getting back onto rockauto.com, it is CLEAR the 2nd link I have listed is the right part. Just shits me they have 2 kits listed, and 1 obviously does not fit at all.
And yes, I do have 1st gen TT brakes.

[GTOJOE]

Maybe JDM and USDM have different sized pistons??

[GTO Assassin]

I know this wont help you now, but when I had my front brakes rebuilt a few years back, the mechanic ordered the kit/parts locally.

Scotty

[Polygon]

I would send them back and order them from Cherry Hill. At least with and OEM part number you know you're going to get the right kit.