Thank you Gino, yes I have been aware of the resin conversion set for a number of years now.
However #1, it IS resin. Also, #2 for years Plus Models offered this ONLY as a full vehicle kit of the Blitz ambulance and only recently (2-3 years ago) started offering it as just the 4x4 conversion parts.
I will admit that price is great considering what you get in the conversion. Now if Plus Models stuff was just not so dang hard to find, the company so hard to deal with and that they only do periodic limited reruns of certain kits so items are often sold out and/or order lead times (delays) can run into months or years.