In reply to Hartlepool Anthony:
Go to ebay, search crampons then used. I found 79 pairs
Any of those with straps only plus a plate between the front and back would be fine. One size fits all . This sort of thing
CAMP-CRAMPONS-393/352227817105?
The older looking Salewas may well fit but I don't know how bendy you boots are and what size.
Stacks about, being replaced by over complicated new kit.