Here's how I do it...
I use an SPF020 bush. This is the GREY bush shown in the pic. SPF021 is the green bush, the yellow and blue bushes are both spf155's but the yellow is old production, the blue is new production and duro 70 rated supplied with the steel sleeve.
I think the SPF020 is a better choice. While totally crap for their intended application as a suspension bush in a 124 (they are an EXACT copy of the rubber original, so when the OE steel sleeve is press thru the bush effectively locks solid) they work great as a replacement "dog-bone" bush for a 128 / X19
Take to the edges of the SPF020 with a hand held grinder (I mount mine in a vice, I don't like to use my bench grinder for plastics/alloys) a bit like this, it's not rocket science, just so it goes in a little easier.
To get the old bush out of the torque rod, press out the centre steel sleeve
make sure you clean the sleeve up, they are usually a bit rusty.
next step is to remove the old rubber bush from the arm, pretty simple, bang an old screwdriver thru the top, and twist it out...
original bush next to the SPF020 and SPF021
next step is to simply by hand slip one end of the slightly modified SPF020 bush into the torque rod end, it should be a snug push thru the hole... I usually run a hand file around the inside of the steel bush ID to make sure there are no rough edges... and rubber grease is always a good thing.
next step I actually forgot to take a pic of, but it makes the job much much easier... slip the inner steel sleeve into the urethane bush...in this pic it would be in from the right hand side... but ONLY PUT IT IN ABOUT 1/3 OF THE WAY.
then put the whole lot into the vice again with some appropriate sockets and give it a squeeze.
after a bit of jiggling, you'll get this....
now the bush is actually a tiny bit too wide, so take to it again to trim it for length with the angle grinder...
I've done this a few times so it took maybe 20 minutes from start to finish including stopping and picking up my phone to take the pics.
SteveC