Might want to confirm the cutoff but I thought the F1's had raised side beds thru mid year 1950. If that is true they would work for 49 and some 50's. fwiw...
http://www.fatfenderedtrucks.com/partsinterchange.html
Yes it works. I used it on a 2006 ford explorer that had a radiator leak. Replacing the radiator required evac, disconnect and recharge the ac, flush the transmission fluid and of course replace the radiator... very expensive repair. Bars leaks was $3.79 works great.