That's a "dilda" laser, which is very common around here.. I don't own one, but if you describe the lenses I can help you figure it out. You could also probably figure it out yourself through trial and error. The spacer goes between the two lenses, so it's only a matter of figuring out which one goes first and which one second and their orientation (which side of the lens goes which direction).
Hi one is small lense like half a moon shape. The other is two lenses stuck together, with one bigger than the other and the smaller of the two is clearer than the other one .