Thanks @
Shady195
In preparation for the install I'll order new bolts. From my experience with the front, I am guessing a likely cause of the problem are rusted bolts. Some rust debris getting caught in the thread and causing damage?
Should I go ahead and directly get an M14x1.5 tap too and run the tap through before reinstalling the bolts? Or is that overkill?
..and if you recommend getting one: What is the minimum length it needs to be to get access without having to take the subframe out completely? Would 7 cm length be enough? Like e.g. [ame="http://www.amazon.de/PROFI-Gewindebohrer-Satz-HSSG-teilig/dp/B002OEPBYK/ref=cm_cr_arp_d_product_top?ie=UTF8"]this one[/ame].