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The full size Pontiac Fuel Senders are a Canister type thru at least 1972, as far as I know they are not available in the aftermarket. The reason they don't have the external float on an arm is due to the baffles they put in the fuel tanks. I had to have the sender in my 71 Catalina rebuilt by a local instrument shop. They did great work and turned it around in 2 weeks. They also to mail order service. If you are interested I will post a Link, but there are several online venders that can do the job.
Here are pictures of mine before it was repaired, sorry I do not have any of it as returned. If your sender looks like this they are not available
Gauge Repair and Restoration for Antique, Hot Rod and Classic Vehicles Bob's Speedometer has been in business since 1929 - for over 85 years, and is one of the world's leading gauge restoration and repair shops! We service most brands and types of gauges - speedometers, tachometers, clocks...