Thanks for all the input. I wish I could weld as I would have already repaired by now. Anyone know the reason for this design? It seems a bolt through a right angled piece attached to the strap would work just fine. I just dropped the tank off at the radiator shop to fix the leak at the gas outlet fitting so I have a few more days to seach out a remedy.

I welded new thread ends to my tank straps, work great for 4 years. Thats how they were made at the factory.

Since the fuel tanks for 49-52 Plymouths are the same .... at least all except Suburban and Station Wagon .... I assume the part number for the "Fuel tank support strap" will be the same for all years ... or at least will work for all years.    The Mopar Part Number is 1126688 and requires 2.  Same number listed for both P17 and P18 models of 1949 ... I don't have a 52 parts catalog.   I did check the Hollander Classic Exchange book and it confirms that 49-52 Plymouth .. except Suburban and Station Wagon ... use the same gas tank.     Dave Kruse also sells the stainless version of the adjustment nut .. he's Krusn64 on eBay.   I've also seen a gas strap repair kit on eBay that looks nifty.   

My part book only goes to 1948. The part number for the 17 gallon tank from 1940-1948 is #855192.

I searched a couple of vendors who list parts online and partsvoice.com and did not find one.

You may be able to make the threaded end if all else fails.

Someone may have a parts list for 1952 and could give you a different part number to search.

Thanks for the input so far. The video was interesting and I had purchased some gaskets from Dave. I probably need the strap ends more than the nut/sleeves. You said you found some NOS ends. I do not have a part number book. MVAIR, Do you still have the P/N. Thanks

The fuel tank strap sleeve nuts are made by Dave Kruse at Metal Rubber in California. I did a story about him in this video: http://www.youtube.com/watch?v=HzrrGr2AZ8Q&feature=channel_video_title (Jump to 4:15 in the video for the section on his operation.) His contact information is in the description of the video.

As far as getting the old bolts off. It may not be possible. The best chance you have if they are rusted is to soak them as you described and then hold an adjustable wrench on the end under the trunk floor and attempt to unscrew with a socket. Since there is such a long secition of the thread that can be rusted, it may not be possible to remove them without breaking. I talked about this in my video: http://www.youtube.com/watch?v=eXwSPdwESwk&feature=relmfu

It would not be difficult to make some new straps using your old ones as a pattern. You can sometimes find NOS straps, but that or hit and miss.

here is what I found in one 2007 Ply Bul. btw. I didn?t find the offer in the latest, at least not w picture.
Greetings from D?sseldorf!

If memory serves me correct, there was someone in the bulletin that made new straps and another one that sold repro nuts and bolts for these straps.

Patience is a virture when removing the old nuts and bolts.

Good luck and please keep us posted.
Bob

Hello all, I am trying to get my Plymouth road worthy so I can travel to the Pacific Grove meet in July. First order of business was to have the leaking gas tank repaired. The threaded end of one of the straps broke. I have soaked the heck out the remaining strap and have not yet attempted to remove the nut/shaft arrangement. Any suggestions on where to get another original type strap or a different strap altogether? I am not fanatical about originality. Also a technique to get the other strap off. Thanks for any comments