rear mount tank without cutting bed rails

[Theboatandcarman]

hello all, ive been googling for about an hour so now its time to post.\
what are my options for a rear mount fuel tank with a side fill, that doesnt require cutting the bed rails? i just fixed all of mine so i need to prevent cutting them up as much as possible! i saw the blazer kit many times in my searches, but no info on how much the rails have to be cut and where. i can always relocate the fill neck if thats the only thing interfering.

thanks!!