Attn WB experts ... advice needed.

[HK1837]

It won't be a factory M41 in a WB. If it is an L31 plated WB tonner it'll be M38 or M40 transmission.

As Greg says, keep the WB inner guards and if the WB support is rusty unpick the spotwelds that hold the radiator to the support and modify the HJ-HZ support to accept the WB radiator mounts. Takes some time but worth it. This way you can run the better WB radiator and with the WB inner guards you can use the WB washer bottle/radiator overflow and canister. For the nose just find a HQ-HZ bent chassis and cut the snout of both rails and weld them to the WB rails, this will allow you to bolt the HJ-HZ bar on properly.