Firstly I measured (three times to be sure) the distance between the rear trunnions on the old subframe. This distance was 1285mm. I then cut up an old piece of angle iron to the exact length (minus the width of the trunnions) and then welded a pair of old trunnions onto each end of this. I double checked that the new jig matched up exactly with the old subframe and thankfully, it did.
Here's the jig:
I then measured and tacked the new subframe moutning in place, and checked that it aligned with the otherside using the jig, like this:
Luckily everything seems to have lined up first time! I was pretty worried about doing this, but it seems to have gone well...
