No matter what LEDs you use, you're not going to get a completely even light distribution across the panel like you do with incandescent bulbs. If the unit has a transparent colored film on the back, make sure you leave it on there.
And as far as the 194 vs 161 bulb. They'll both work. The incandescent variant of the 194 bulb is 3.78 watts and the 161 is 2.66 watts.... so the 194 is about 40% brighter. When shopping for LEDs, most places just group them together and you're going to get the same bulb regardless.
Another word of advise: Buy high quality LEDs. Steer clear of the eBay garbage from the China sellers, or else you'll be tearing it all apart again a month from now.