USA hook and loop couplers

[old shay]

the little springs just where to you get these springs

[piercedan]

I have found the following for the hook and loop springs:

 

Bachmann springs are thinner than either LGB or USA and tend to break faster than the others.

Train-Li an advertiser in Garden Railways stocks the LGB  coupler springs in packs of 8.

I am sure there are others that have them also and the LGB/USA/Bachmann hook and loops all take the same shape plastic springs