This part is discontinued and is no longer available.
However, for part MA53502: AS797035 is a potential alternative. Pleased be aware that this lock doesn't have rollers and ISN'T split spindle
Part: V-MPLSS35 is also a potential alternative. There's no direct replacement for this lock so we'd recommend a VERSA repair lock, which is supplied with replacement keeps. If offset handles have been used, they will need to be replaced with inline handles to suit the VERSA lock.