Sending Unit for 73-81 Blazer/Jimmy/GMC Truck?

[kevin67c10]

Folks,

I got a gas tank to put under the bed of my 67 chevy pickup, and it is the following:

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High quality Ni-terne plated steel gas tank with 3-year warranty
Applications:1973 - 1981 Blazer (fullsize), Chevrolet Truck, GMC Truck, Jimmy (fullsize), Suburban, 20 & 30 series, 2500 & 3500 series, rear mount, conventional cab
Features: Small filler pipe 1-1/4" ID, Depth of bottom half 3-1/2"
Capacity: 25 gallons
Dimensions: 28-3/4" x 28-1/8" x 10-3/4"
Original Part Number: 475428
Packaging: Boxed
Part Number: GM-15A
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The problem is - Nobody can tell me what sending unit to get!! I have been told 2 different things - one is Part #SUFG12D,
and one is part #FG12Q (which is not in stock anywhere)!!!!

If anyone could give me an idea where I can find it, or any more information, it would be great!!

kevintsmith@Mediaone.net http://www.trumantruck.com/