I put a bigger than stock battery in my diesel pickup ,so the original hold down couldn't be used..
I made a hold down strap out of a used serpentine belt ,folded over each end and punched a hole in it so I could bolt it to the inside of the fender and at the original hold down bolt hole..used threaded rod so I could take up the slack and make it tight..battery aint going anywhere now..
I never liked the oem hold down that just pinches against the battery--too easy for it to let go or ruin the battery casing..the belt works well,it wont short out against the terminals like a metal hold down or strap,they are very strong and resist battery acid..
My inner fenders are swiss cheese so I had to use the strap,I didn't trust the battery tray alone to hold the battery in place..good thing the battery tray bolts to the inside of the fender because the inner fender or "splash shields are junk,I did put some galvanized sheet metal over the missing or rotted areas,but the metal is so thin from rust it didn't beef them up much..truck really needs a nose,the fenders are patched up junk now ,only part any good might be the radiator support..