Original MK1/2 shape Windscreen washer cycle type bottle clip, about 1964 on.
Has yours disappeared, or just disintegrated with age?
The original winguard MK1 bottle part number was ADA3833 NOW
17H2536 for MK1/2.
The bracket for bottle is
37H9712ORIGINAL and for MK1 use the wire clip
37H9672 - 2 clips for MK1 pre1965 and for MK2 use 1 cycle type clip
24A1387.
A new complete stainless steel bracket to hold the bottle is also available as 37H9712.