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A friend with a 70 fastback wanted more tire but did not want to modify the back seat. he simply marked where the fiberglass panels sat and came in that amount and doing the pie cut in the front . he also removed the bracing inside those panels so the fiberglass sat right on the tub

Classic Rock ,used to be country but it has bit the big one I guess ,I seldom even listen to anything any more

Drill Hog and Bad Dog bits (possibly the same bits/company) are the only ones I know of with a lifetime replacement guarantee. I have no experience with them though. I very recently decided to splurge and bought a $100 set of M7 HSS Norsemans because I have some higher strength 1/4" plate that my Dewalt and other box store bits wouldn't touch. The bit went through he steel nicely but the dang thing chipped on first use, so not exactly happy about that. Gonna see how Norseman's customer service is. I specifically didn't get cobalt bits due to that concern, yet HSS did it too. Also, Norseman, Viking, and many others are all the same bits anymore. I'd be surprised if Drill Hog and Bad Dog didn't source theirs from the same location....

When I was building my 69 Mach 1, I planned on using a rear sway bar and had bought one. With a 1⅛ inch front sway bar, 245/40-18 in front and 255/45-18 on the back, I don't need a rear sway bar. My car is neutral thru pretty fast and tight corners. YMMV.

I bought this one, and recommend it, many years ago when they were less than half that price. That sway bar and the one inch Shelby drop will make a world of difference in how your Mustang handles. https://www.npdlink.com/product/front-sway-bar-kit-1-18/208686