Sorry I didn't realize your location. The tang safety conversion on the mauser is a custom proposition here. I've not seen the components available as a kit. Usually there is an extension added to the tang of the rifle which is cut to provide a guide for the safety button. The button extends thru the extension and connects to a sliding bar on the bottom of the receiver just back of the trigger assembly. The trigger is notched so that when the safety button is drawn to the rear the bar enters a notch on the trigger assembly, preventing its movement. The safety button and the locking bar are usually connected via a spring wire, bent so that it's removal requires the safety slide and/or the lock slide be removed to disconnect it. The safety button is usually retained by and transverse pin which also is acted on by a flat spring to provide a pair of detent positions,=off and on. If the safety button is slid rearward the lock bar enters and immobilizes the trigger sear. This is a 'trigger block' type of safety device. I prefer the M70 style safety lever, mounted on the bolt shroud. It cams the striker out of engagement with the sear and locks the striker against movement. This is the most positive form of safety I've ever seen..or heard of. These are available for many mauser rifles and while not cheap are very effective..