oil pump cover

This will be tech but also a shameless plug to the kit I sell. I have had this kit for over a year and a lot of you have bought it, but I wanted to post the info and pics on here as well for those who want to do this. Also, I sell 2 kits. They are the same except one has an OEM Toyota...

So here I am 3 screws stripped. I tried the speed bits and wasn't able to grab a bite. So I drilled the heads off and wondering if I should drill another hole into the bolts and try the speed bits again or another type of drill tap of higher quality someone may be familiar with. These were the...