Melling Factory La/Magnum HD lifters

https://www.ebay.com/itm/334321907428
https://www.summitracing.com/parts/mel-jb-2225/make/dodge
the PN is JB-2225 and most parts stores carry them as well-- you might be able to game the system with vato-zone where they give you 20% if your order more than 3 of something or over a $100 or whatever their current promo is.

rock has the lowest price by like a dollar, but you'll probs pay that back in shipping from those meanies.

if you're friendly with your local dealer, sometimes the parts counter there will give you a little break and sell you at "racer net" or just cuz they wanna clear product.