what are these parts exactly ?

[Fast68Chevy]

469850
RETNR: UPPER RETAINER: W/AC

3901448
RETAINER: LOWER RETAINER: W/AC
1

3810706
TRUNNION: STEPSIDE TRUNION: QTY2


and howcome local dealer says batt tray assembly bne discontinued since 84 yet GM Parts says there are soem for 13 bucks ? http://www.gmpartsdirect.com/restora...3&startrow=145



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Randy- Lincoln, IL
randy@ccaonline.com 2177353230
*many GM parts bought, traded, or sold -am parting out: '81 Cutlass Supreme Brougham

current fleet: -71 C-10 350/CH465/3.07- basketcase, #1
-90 Cavalier 2.2L sky blue, a driver
-84 Z28 5.0L/700R4/3.73 daily driver
-84 Firebird/SE 2.8L/T-5/3.73/engine bad, project #2
-82 purple Trans Am, project #3
*Paint is overrated*
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