Thanks for that Bartamos,Im gonna think and look lots before any cutting .Will make a template that fits in the opening with zip cut marks for reference ,they can be welded back in,.Athab3

Have 55 GMC 9300 short box step side .Needs restoring but starts and drives ,no brakes, also have 59 GMC 9380 with very good cab for parts.have been doing MGA's all mjy life so this is new to me