Harland Sharp also makes rockers for the Viper engine but while it appears they will work with the correct stud (5/16 bottom and 3/8 top) they are not self aligning so pushrod guide plates and hardened pushrods would be needed. The stock Viper and truck engines appear to use the same rocker, probably why it's beefier than the V8 stuff. The Viper rocker arm kits use the 3/8 - 3/8 stud but you can buy the 5/16 - 3/8 studs separately. Same as would be used on a V8 Magnum. Pushrod length is on you to figure out. You need to replace the lifters and pushrods any way so just mock it up with the old parts and see how it fits before you buy pushrods.
I loved my V10 truck and would like to build a 1st gen V10 truck but parts availability stops me. Good luck.