I have always burned the rubber, & pushed it out, then cut the shell in 2 places with my trusty torch. the shell pretty much fall out after it cools. after you clean up the holes with some emery cloth(not too much), you can press the new pcs in with a bench vise using the large socket method........carefull not to bend the arm....... 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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