we need pics .........
I was actually joking. Don't own a JK. But do wish I did have some pictures for you.
If I did have a JK, though, I would actually consider hiring a good fabricator to put a JK-sized "YJ" grill together. Just for laughs really.
Actually though, that kind of thing could end up turning in to an interesting low-volume, high-dollar-per-unit fab business once the fabricator worked out the kinks.
Bad news is that the Fabricator might end up spending months trying to make a version that looked anywhere near OEM. First try might end up costing a guy $10,000 or more in time, effort and materials even if he was experienced.
Maybe if the fabricator relaxed his standards a bit he could keep the initial costs down.
Actually a well-measured, flat sheet of steel would probably get the job done fairly well. Just cut it to the dimension of the JK grill. Then measure and cut out the JK grill slots. Then measure/cut for rectangular headlights and signal lights. Drill your holes for mounting hardware. Then Prime, paint the factory color and install. And obviously, you'd have to pull your JK's round headlights in favor of YJ-styled rectangular (HID?) lights
Wouldn't look OEM-quality up close, but it might do the job at a distance.
JK with a YJ grill