I guess all you have to do is keep an eye on the height of the bulb to the top of the lens. Wouldn't want to melt the lens. I think you have Grote lights, correct ?
I think that lens is a little higher than the Trucklite lens, giving you more height for the taller 1157 bulb. It's a good idea though to have brake lights to. Especially if some is traveling close behind you.