You are quite right Ben on the size, and it would be better and cheaper to buy the 1/2" drive type
I have just fitted one like this - however I did find that my socket did not go in deep enough as the flange prevents it, and with the chamfer lead into the socket, I thought that it might slip off.
I modified the socket by thinning down the lip of the socket a little until it seated properly (using a grinderette and 50grit sanding disc)
It also came in when I replaced the pinion oil seals, as they have a similar type of flange
You might also buy a long handled 1/2" drive wrench to make the job easier. they come in useful for lots of jobs.
"
You can never have enough tools," my Grandad used to say
"and buy the best you can afford, as the quality will remain long after the price is forgotten"Have Fun
Regards
RR

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