Going to need to count splines and decide on a one piece or two piece with a centre shaft support bearing, get you length from centre of u joint to centre of u joint
Go to the auto wrecker bring a wagon, make a day of it and enjoy the Saturday, lot of good information in here, quite sure someone has a post about gauges
Better going to the wrecker to find one, but maybe someone will have one @AuroraGirl @Grit dog @bucket maybe or @HotRodPC may have a better idea who’s got one laying around