sidemarker filler with blazer tank?

[71Rat]

has anyone done a sidemarker fuller with a blazer tank and how do you go about it and what parts do you need? i have seen a write up for it on a step side but havent found one for a fleetside. i have a long bed fleetside and was wondering if i should go about it in this direction or try to do something else. any input would be helpful

Thanks a lot
Rat