I have used these for just that purpose. If the LVL is already supported with jack studs, then these used to just hold the jack studs to the LVL is fine. No weight is on them, they just prevent the LVL from sliding out of the pocket.
The RTA2Z is 16 gauge. A request has been submitted to have this corrected. Thank you!
It sounds as though you are looking for a Header Hanger which we offer, but not for a 2x4 header. Please see the HH4 here on the Home Depot website. Thank you!
The dimensions are: Product Depth (in.) 5.5625 Product Width (in.) 5.9375 Product Height (in.) 1.435