1973 TCS 5 speed trans wanted

[HelpMyLotus]

My dad's car I've posted here about has finally succumb to disfunction.  I gently held the clutch on an incline while the light turned green then accelerated through the light.  The car made some 'noises' so I coasted to a stop on the side.  It came to an abrupt stop and the wheels no long turn. 

I have the trans nearly out but I'm writing in hopes someone can shed light on possible replacements. 

It's a 356 5 speed box in a 1973 TCS.