As far as I know, the 120 and 140 models typically came with a 4-speed manual transmission as standard. However, there might have been some aftermarket options available for a 5-speed setup, but it's not super common.
As for the shift pattern, with a 5-speed gearbox, it would likely follow the standard H-pattern, with reverse being to the right and down. But without more specific info, it's hard to say for sure.
If you're thinking about upgrading to a 5-speed, it could be a cool mod for your Jag. Might be worth looking into some aftermarket options