Futaba 14SG spares?

As commented on 'Been Flying' the Rudder trim on my 14SG isn't working, while flying a few days ago I noticed that left aileron trim was erratic, not good so I decided to attempt a repair. These are the buttons, 6.15mm in diameter, standing just over 4mm off the board, does anyone know where I can find these?

They only have 2 legs, the ones that are fitted to most appliances have 4
 
It must be a function of our heat and low humidity, I've had to fit new push buttons of the 4 leg variety to a number of our appliances.

Or these from RS - 9p each. - packs of 10 - uk.rs-online.com/web/p/tactile-switches/0102399

Thanks Bill, sadly these will be way too tall.
Thanks Eric, these are surface mount, they would probably do the job if I could find a way to solder them down.

Thanks guys, knowing what the correct terminology is does help, I found exactly the right ones on Aliexpress, 10 for a pound, a fiver for postage but now the order won't go through!

I've had the same trouble with Ali. I found that if I kept logging in with a different passwords until I found one it liked, I could place an order, but had to revert to my original password to see updates for delivery, etc!
It's a weird system! I prefer bang-good, but that seems to have gone downhill recently, a bit like Hobbyking!
The main bugbear of any of them is the anything up to 28 day delivery times.