How do you replace a sliding door lock on a 1991 Toyota Previa?

start by gently removing the keepers at the panel you have to get inside to get panel out after that you see the retainers the rear roller is, if you open the door a little you will see them is easy to take them out but to installm you will need somebody to help you hold the door and have to be properly adjusted,i myself as a toy tech dont recomend to anybody to this ps:for the rear roller you have to get right by the rear of the door to see the retainers