HJG can offer the following correct UI B737 3D model and livery for "PARCELAIR" .... B737-476 SF ZK-PAQ .... painted with precision by my HJG management partner Peter LIDDELL ....


It also offers the following "TOLL" texture for the same model/base pack too .... B737-484 SF ZK-TLL .... painted by Peter as well ....


If these simulations work with P3D "V3" (they won't using V4 though) then that comes as "a surprise" to me because such was never intended, but, I'd really need to see/closely examine evidence supporting this for myself before I promoted such early P3D portability
For what it's worth anyway ....
Go to HJG "DOWNLOADS"
https://simviation.com/hjg/Select the "B737-400 SF" section.
The above illustrated "PARCELAIR" and "TOLL" textures, and their supporting aircraft base pack, are each located there .... confirmed to be FS2004 native and also perfectly FSX portable too.
The FD windows are transparent, but HJG's preference is for a more realistic shadowed/darker rather than crystal clear/transparent FD window effect .... as discussed within the following extract of one of our own forum presentations .....
This transparency may may be positively, or negatively, impacted by FS version effects. All of the B737 models offered by HJG are based on the VISTALINERS originals .... but .... ours being "2015 edits are "different" compilations of these". Old FFX, SGA, and VISTALINERS released B737 textures will work (some won't though) on these newer models, but, won't display the same "sheen" (shiny surface effects) when used on the HJG edited models. All of the HJG offered textures are produced specifically for these "newer" models.
The HJG offered B737-300/400/500 panel is FS2004 only compatible though .... but FSX alternatives are available from both FS.COM and AVSIM.COM ....

Separate FS2004 and FSX specific versions of the customized HJG B737-400 CFM-56 turbofan sound pack by HJG audio colleague Benoit PLAMONDON are also available from the "BOEING SOUNDS" section of HJG "DOWNLOADS" ....
https://www.youtube.com/watch?v=Zpw1m8m2YKYFor reasons of FDE compatibility/customizing HJG offer "separate" B737-300, B737-400, and B737-500 sound packs. These sound packs will only work as intended though using the HJG FDE (both CFG and AIR data) .
Mark C
AKL/NZ