Help sizing mainspring

[AP1875]

I unwound a mainspring from an automatic chinese watch. 

As I was greasing the mainspring the end snapped very easily. 

 

I need to purchase a new one from Cousins. 

 

The measurements I have are 

1.43 high

1.12 thick

500mm long

 

 

I can't seem to find anything on cousins that's close to these measurements? 

https://www.cousinsuk.com/category/mainsprings-by-list-watch-pocket

 

Is it important to get the exact size? How far can I deviate from my measurements? 

Could I use a valjoux 7750

1.50 x. 115 x 600? 

[oldhippy]

What is the cal number? that is all you need. 

[AP1875]

1 minute ago, oldhippy said:

What is the cal number? that is all you need. 

It's a chinese clone, so unfortunately I can't rely on referencing the cal. the sizes won't be right. With the measurements I know exactly what I need. 

Nothing matches up precisely on cousins so I am now wondering how much deviation I can allow for? 

[watchweasol]

Hi   what is it a clone of.  with chinese clones getting the actual replacement will be difficult better to get a GR spring a close as possible making sure the spring height is the same or less to avoid binding on the barrel cover

[rduckwor]

If you must choose, I would match the spring height and strength (thickness) and go a slight bit shorter rather than longer.  A longer spring may bind in the barrel or worse, not fit at all.

Good luck.

RMD