Image of inside of HP71B HP-IL module

[mfleming]

This image from the Hardware Design Spec may help visualize replacement contact fingers.
   

The fingers look to be about 10 mil thick (0.010", 0.25mm) phosphor bronze that you may be able to fashion for yourself from sheet. Another possibility might be half-round jewelry wire of the right gauge. Anything that makes contact will do, since you're unlikely to remove the module once it works!