Thanks alot Brett! lol Just a year too late w that info. ,thats exactly why I now have an 'extra' tank for 69....! I ran out of gas , filled it up ,only got 15 gals. in it...thought former owner had put a 'cheap' 15 gal tank on and decided to replace w the 'real' thing! got my 18 gal from Classic including new straps ( since I knew 18 must be larger than 15 I wouldnt be able to re-use the old ones!) , installed tank and found they were the same size! ended up using the same straps , sold the extra ones , now stuck w an almost new used tank that cannot be shipped! Trying to GIVE it away , but needs to be to someone that can pick it up in Houston...
I ran out of gas , filled it up ,only got 15 gals. in it...thought former owner had put a 'cheap' 15 gal tank on and decided to replace w the 'real' thing! got my 18 gal from Classic including new straps ( since I knew 18 must be larger than 15 I wouldnt be able to re-use the old ones!) 
, installed tank and found they were the same size! 
ended up using the same straps , sold the extra ones , now stuck w an almost new used tank that cannot be shipped! 
