Do they both take the same size 4 bolt stems?

cheers.

Both what?

If we’re talking about bolt on/direct fit stems, then I believe they are an IS fitting, so should be the same(notwithstanding the usual farces that go with setting up standards).

There are usually different direct mount stems for RS,Fox and Mars etc.

Modern RS & Fox all use the same standard nowadays, older Fox didn’t

Marzocchi were different until this year, they’ve moved to the same standard now.

And the Sunline one is under £30 at CRC now

I believe Fox adopted the Boxxer “Standard” on the 40 and I seem to remember there was an Open Source drawing from RS giving the hole positions on the upper crown, Their hope clearly being everyone would buy into it….

Not sure if Marzocchi or Manitou did though…

Edit just read above, looks like Marz are in too… good stuff.