[Brakes] Are brake pistons / seals a common size?

[flanagaj]

Hi All, it's a while since I have posted on here, but I am sure one of you will know the answer to my question.

I have a binding front passenger side brake.  Jacked the vehicle up yesterday, and it was really stiff to turn the wheel by hand.  I then retracted the piston back in, and this has freed it up a bit, but it is still dragging relative to the driver side.  So my plan is to just replace the cylinder pistons and seals (don't simply want to replace the whole caliper)

What I am trying to understand is whether the pistons / seals are common spec across the calipers or whether they will differ.  Apart from a Peugeot logo on the caliper I am unable to tell what brand is on the vehicle.

Thanks

[geoff]

Look / aske here

https://www.ebay.co.uk/itm/284099688686?...BMvJTWxORj

[evdama]

Can I ask why you don't want new calipers.? 
I had the intention of rebuilding my rear ones  but after watching a how-to horror video I quickly decided complete replacement were a way better option
Life is too short.
If you go for the lower price point you can also return your old ones for recycling.

[flanagaj]

I enjoy a challenge, and the rebuild kit only cost £30