Just changed my diff oil and found that the original plastic fill plugs were in pretty poor shape. I needed to make the truck driveable so I put 'em back in, but who sells those nice brass fill plugs? I've seen them on at least one online vendors website but can't find them now. They look like a simple brass pipe plug - does anyone happen to know the size?

 

not sure about brass ones, but i know QT has some. if you find out the size of the brass i would liek to know as well.

 

I believe this is what you were looking for...

Expedition Exchange Incorporated :: Discovery :: Expeditionware Brass Plug (EW32)

 

That is neat to know. If the older rover radiator fill plug is the same size as D2 diff plugs, rovahfarm has them for 3.99

RovahFarm for all your new Land Rover Parts and Accessories

 

Justin at Lucky8 has the QT diff fill plugs...

 

what is the size (for socket/torque) of the default fill plugs vs. the QT brass ones?

 

Can't tell you for sure but the brass plugs have a o-ring and don't need to be tightened too much.
Boy, I bought my brass plugs from Jon at E.E. for $8 a piece a long time ago.

 

You can also use the plugs from a DI or Range Rover Classic.

 

I think its half inch US. I used a boat fill bilge plug and it slowly went it. Its not leaking and so far so good.

 

They aren't NPT threads. They are BSPP.
Trevor at Rovahfarm has about the best price on them, about $3.50 I think.
Unfortunately his website is down for maintenance right now, but I have his phone number.