If you are talking about the plug with the screwdriver slot in it that is a pain in the b*tt to get out,just get a 1/8 BSP plug,the original are 1/8 NPT.The thread is virtually identical to the original and fits spot on,they have an Allan key fitting and are a little longer so stick out a little more than the original.
Yes EBC 174HH are the pads to use in my opinion.