Hi Ironbark,
well here we go again, another can of worms, I throw those airfilters out because I only use LM carbs and snorkel on them not the G3's. This involves modifying a LM manifold to fit on the inlet barrel spigot. I have done quite a few of them, fairly easy if you have a lathe. As for wheels the wheels with the 1/2 inch axle are ok you just need to find a good set of wheels off something like an MTD because these sort of wheels have bearings unlike the Victa which only had bushes. Plenty of wheels like that out there. Done plenty like that, pretty simple. If the front where the axle goes through the deck has badly worn as I said I just make up big Delrin bushes and that fixes that problem. I make the bush up to fit the worn out alloy area, then cut the bush in half so I can fit it over the axle and then make up a "U" bolt to hold it all together. Sounds complicated but fairly simple.
Hi Tyler, never seen one worn out in that area, must have been something that caused it. All I do if I have an axle worn like that I just run beads of weld aling the area and then grind it reasonably round again. I have to do this quite often with the Victa front axles where they get chewed out wene the bushes have worn out and the axle is just flopping around