I just replaced both of my lower returns (shower heads) with brass 3/8 union connections from Napa, cost of parts was $8.50. Add a brass 3/8 inside diameter sleeve to adjust overall length.
Guarntee not to have to drop the tanks for rotten hose or returns being clogged with bits of hose or worst clasping hoses.
Union slides over the line and tighten. Completed new addition is just 1/8 of an inch shorter that the dreaded shower head.
I'll post pictures and all part numbers for the quick connector clips for the fuel lines, 3/8 union, slleve and Help retainer kit(includes new gasket).
I did a little over kill with replacing the clips and doing the retainer kit, but I won't have to worry about this problem again.