Dan I'm not sure if the small removable bar will be a good reference point for measurements? did you check it is in the same position on both chassis?
Right here's how my mate Mark did his, I'm wondering if you've just got the engine up too high? the engine mounts on the 1.3 are lower.
O/s mount. bit of 5mm plate ebnt to make up a box section.

- 7567_DSC00124_1.jpg (55.77 KiB) Viewed 5096 times
I did a similar thing using some 4mm angle and plate.
All welded up.

- 7567_DSC00125_1.jpg (71.24 KiB) Viewed 5096 times
N/S mount made by using 2 of the standard mounting spreader plates cut and bent.

- 7567_DSC00128_1.jpg (66.61 KiB) Viewed 5096 times

- 7567_DSC00129_1.jpg (62.03 KiB) Viewed 5096 times
For reference N/S sj413/samurai engine mount position

- DSCF3008.jpg (49.29 KiB) Viewed 5096 times

- DSCF3009.jpg (36.12 KiB) Viewed 5095 times
Note how the centre of the oil filter is about level with the top of the chassis rail
