M915A1? I do not know if one is produced in resin or not. I know there isn't one in plastic.
The M998 is out in several variants. Italeri does the M998 but calls it the "Commando HUM-V". This is the standard commander/staff officer variant with the four seat soft top and the rear cargo extention. It is kit #273. Real cheap and readily available.
A long time ago, they also made a 2 seater variant with a simple 4 Stinger mount in the rear (not to be confused with the Avenger) and called it the Special Forces Hummer. This was actually an M1038 (M998w/winch) and was kit #254.
Revell of Germany reboxes a couple of the Italeri HMMWVs, both of them in the two seater variant. Kit #0313 is a true 2-door M998 with troop seats in the rear. Kit #03027 is the M1038 and includes the rear troop cover (doghouse). My claim to fame is that this is the HMMWV I TC'd as an umpire during REFORGER 1990.
Academy does an M998 in the two seater mode as well and includes the doghouse too. I don't have the kit number off hand, but I do have it at home.
Here is an article I wrote a couple of years ago regarding the various Italeri based HMMWV kits:
http://www.armorama.com/modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=91
As far as the M35A3 Deuce, AFV CLub makes the M35A1 in a Vietnam guntruck mode and the standard M35A2 Deuce that we used throughout the late 1980s and 90s. I do not believe there is an M35A3 version out. The actual vehicle only saw limited use (not very widespread) since the LMTV 2½ and 5 ton trucks came out.