Glue , Stop by your local auto trim shop with a small glass jar and ask if they can sell you " give" you a small amount of glue to repair your panel corners ,Take the panels with you and they just might offer to fix them while you wait ? Or you can order some . They should have the brush on grade that comes in a five gallon can .
https://www.facebook.com/1954upholstery
https://www.yourautotrim.com/welatop...BEgK9LPD_BwEan
I would use the 3M tape before I'd cut holes in the dash cover .
https://www.classicparts.com/1972-77...ctinfo/18-046/
These escutcheons go between the handle and door panel you need 4
Any time anyone needs interior Dye work done rather than trying to find a spray can that somewhat matches spending more money than it's worth . The trick is to go to your local new car auto dealers detail shop NOT thru the service dept just go to the detail shop it's self and ask who they use to do their interior dye work and repair , They are usually on the lot and doing repairs daily , These guys are the pros at interior dye color matching , They have everything in their truck and most will take on a small side job while they are there , Even if you have to do it off the dealers lot They are the best at what they do you will be time and money ahead using them and it will match the rest of your interior , They can do their matching process right from the back of your door panels where its not seen . New car dealers won't spend the money to do repairs on their used cars "reconditioning" before they put the trade in back on the lot they repair steering wheels and small cuts scratches on the interior of the car rather than replace them it's cheaper and faster for the dealers to just use these guys .
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1967 Factory short bed - Old school
'71 - 350 / 4bolt / 487 heads / Edelbrock C3BX
Muncie M-22 4 speed / Hurst Comp plus
Factory 12 bolt posi 3.73 / 255-70-15
Smoothed firewall / Factory cowl induction
Power disc brakes / power steering / 3.5-5" drop