Bengt – Thanks so much for the information. Have been working on the bumper and have salvaged two of the bolts by re-threading them. Test drilled the other bolts and it shouldn’t be too big a job to drill them out.
Had a look for the tool and nuts and found then in a number of places. The existing bolts are M8 but I think I will have to go for a tool handling M6, the difference in price to get M8 is about 600 SEK more. I think the M6 should be sufficient.
Off shopping again tomorrow.