help with changing oyster band with leather strap

[MinMay]

Hello,

I want to change my 73860 bracelet with a leather band.

See picture.

1) Do I need to buy a separate springbar or can I reuse the existing one from the bracelet?

I'm not sure if I can remove it. Any tricks?

2) . If I buy a separate springbar, do I buy a 20mm springbar configuration when the watch has a 20mm gap? Or should i buy a 19mm springbar configuration?

3) Is the springbar hole the same fitting on both end of the case hole?

Thanks so much.