button on my auto tbar shifter broke
 

i was wondering if any of you would know/have any experience with the tbar in the 94 astina , there have been a few things that have gone wierd since the button snapped off such as the key wont come out the the ignition and the lever wont go all the way into park, it stops in reverse which is no good , can you tell me if it is easy to find spare buttons or the whole tbar handle itself ? i notice there are 2 screws on the bar side facing the enging , do these allow me to remove the t handle ? thanks in advance guys