Tymophil,
I found myself in a similar situation w/ an Univox HiFlier. The bridge had a spacing of 15mm. I search high and low and finally found a Schaller bridge that fit the bill at
http://www.dguitarparts.com/.
"BB 3533 Schaller® Bass Bridge, Steel, Black, With Adjustable Spacing 1-13/16" to 2-5/8"
Their website is pretty rudimentary, but they are nice people to deal with. I can't find my receipt but if I remember correctly the bridge with shipping came to about $70.00.
I purchased the chrome model and it is a pretty heavy little chunck of metal....nice finish too!
70 bucks is pretty steep but I am sure that having yours replated wouldn't be cheap either.
Good luck with your project! Post some pics!
PS: I am not in any way affiliated w/ Dguitars