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In fact the NSN number 2320-01-107-7155 is for a M998 BASIC truck which would not likely have the cast mount and variable rate spring.
Yours is obviously a variable rate spring by the fact that the diameter of the coil tapers.
It does look like your truck is actually an R1, I have no idea why the data plate they used did not reflect that, actually the data plate does not state any model and the weight rating of a basic M998, they obviously just got lazy and used what ever they had, the plate on the passenger side was...
I am curious how you know it is a M998? does not seem to be listed on the data plates.
I would say if it has a air lift rear bumper it is a "heavy variant" after rebuild, maybe they did not have any applicable data plates available.
Yes they gave it a new serial number, the MWO was for a bumper reinforcement for the 1097/1097A1 and some of the A2 trucks.
I would say it is possible they rebuilt it to 1097, heavy variant specs but did not change the GVWR for some reason, does it look like they possibly stamped over the...
Here is a link to the TMs, the first 7 should be downloaded as they are the most significant ones applicable to your M998
https://www.nsnlookup.com/equipment-intelligence/land/hmmwv
Well, let's see.
You said M998 not M998A1 so the UOC (usable on code) for the M998 is H13 (all models applicable to a particular parts TM is listed a few pages after the TOC, table of contents)
After downloading the parts TM which is free here on this site and you confirm the UOC then you look...