NOTE there are two sizes so make sure this matches BEFORE ordering
This is the small pulley measuring 5 and 7/8 inches in diameter. Very good condition. No bents or dings.
1981 to 1984 300SD SMALL Water Pump Pulley - USED
$45.00
SKU:
USED-300SDSPULLEY 
Product Details
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$59.50
126 300SD Turbo Diesel Contitech V-Belt Set
New! Extra belts are included, so you don't have to pre-measure or end up with the wrong alternator belts! PDF instructions included
This is a very important maintenance item for 126 300SD 5 cylinder turbo diesel owners. When these belts get loose or worn they can cause all kinds of problems like poor battery charging, engine overheating, jerky power steering, and noises that range from squeaking to rattling.