Can you put an A 19 Bulb in your Lava Lamp?

My Lava Lamp said to use an A 15 aplliance bulb. I went to Walmart and they didn't have them so I thought the A 19 replaced it. Worng. The A 19 does not fit. My lava lamp had a sticker iside of it saying what type of bulb to use, but, of course, I bought the wrong one. The A 19 is too tall, the bottle didn;t fit.