3M 65489, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc DUH5120TRI-10I, 5 inch UH, 120, 7100202873, 10 per pack 
Insize 6208-80E, UNIVERSAL MAGNETIC STAND, 6928640329784
$72.44
For electronic/dial indicators and dial test indicators.
Magnetic Force: 176lbf
Applicable Holding Stem: 3/8″ DIA
With fine adjustment and dovetail groove
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3M 08217, Universal Adhesive Clear – 3, 200 mL Cartridge, 7100006285, 6 per case
$67.63