I’ve got a Reba (2017 I think) RL gold, solo air  with boost spacing which is set to 120mm

I’d really like to set them to 140mm but it’s pretty conflicting online whether I can or not via a new piston rod.

Anyone know and if so which piston rod I need?

I don’t think you can on yours, I see there’s a 130-150 “A7” 2018+ model (page 158: https://www.sram.com/sites/default/files/techdocs/rockshox_spc_revd_2.pdf ) .

For that one you would need:

11.4018.026.026 FRONT SUSPENSION INTERNALS LEFT AIR SHAFT SOLO AIR – REVELATION (140MM 29/27) REBA A7 130-150MM (2018+)

When I was looking to up the travel on my Revelation solo airs from 130 to 150 I asked my local Sram service centre type place and they found out for me, then ordered in the correct part and fitted it. All in £60 with a quick lowers service (although not new seals). They came back so much more plush it was game changing.

Thanks for the replies