no markings at all

A handy person from England says:
June 26, 2017
There are 3 constant force coils per side.
The window weights 35.6lb
the pivot brake/shoe is 30mm (1 1/4inch wide) by 30mm (1 1/4inch) high and 14mm (1/2inch) depth(depth of the channel.

Looks like the coils are either 165 or 160
Pivot Shoe is either 15-111 or 15-191

Can you point me in the correct direction as to which would be best and the cost to replace both side in one window?
This is not something that is used a lot in the UK so finding someone who can advise is difficult.

Any help appreciated.

Cost of shipping and time would also be useful.
Coil assembly
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Tom from SWISCO responded:
June 29, 2017
I agree, the 15-111 looks like a great match. These are meant to be used with the Series 160 coil spring. You'll need the number from the old spring to determine the best Series 160 option.

We do ship internationally, but through a third party shipping service. For more information see, our shipping policy here.
Pivot Shoe, 1/2" Thick
Pivot Shoe, 1/2" Thick
15-111
$2.44
Heavy Duty Pivot Shoe, 1/2" Thick
Heavy Duty Pivot Shoe, 1/2" Thick
15-191
$2.57
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