Door lock screws

The screws on my existing deadbolt lock are too long for the SimpliSafe door lock. They are also too wide to use with the provided washers and too narrow to hold the mounting plate. Reached out to customer service that said they had no shorter screws to provide and then after reading verbatim from their webpage about shorter screws was then told they did have them. Not sure if the shorter screws will work. Looking for any possible solutions.