I believe my answer has been found:
http://www.tandfonline.com/doi/abs/10.1080/10705511.2012.713275
Ghisletta, P. & McArdle, J.J. (2012). Latent Curve Models and Latent Change Score Models Estimated in R. Structural Equation Modeling: A Multidisciplinary Journal, 19, 641-682.
I believe my answer has been found:
http://www.tandfonline.com/doi/abs/10.1080/10705511.2012.713275
Ghisletta, P. & McArdle, J.J. (2012). Latent Curve Models and Latent Change Score Models Estimated in R. Structural Equation Modeling: A Multidisciplinary Journal, 19, 641-682.