LWB Extension & Bumper Wanted!

[Timelourd]

The mounting on my LWB extension (bolted to the original chassis) is all rusty.

The original chassis is pristine, of course, but whomever bolted the extension on decided to leave it unsealed so its been rusting to sh*t ever since.

Any advice whether I should get a transit specific chassis extension, or if any old 3.5t chassis extension would do fine?

I'll be heading to the nearby scrappy, if so.

Located in Falkirk, Scotland.