It's worth double checking your measurements to be certain, and make sure you are
measuring from centre to centre on the posts.
I've found this WD ABR Bridge
with 74mm centres. As it is not expensive it might be a
candidate for modification by drilling the holes out slightly larger, which is how most
users resolve the problem.
Apparently, WD Parts used to carry a replacement
with 72mm centres but that is long discontinued. However, I found a link to a suitable
replacement from the USA. It's $50, but don't forget you will have to pay shipping, Duty
and VAT to bring it to the UK. Greasy Groove Inc
is the place if you are interested.
a little lateral thinking I managed to discover that the Fender Jazzmaster/Jaguar bridge
is on 72mm centres. And here's
one I found online. And I am sure you will find
plenty of other options if you go that route.
Hope that helps
When the going gets weird, the Weird turn Pro.