72 Jimmy/Blazer Bed dimensions

[TXJimmy]

I have to replace my bed floor due to rust. I have a bed floor from an 85 or so blazer and it is a little short. I will be reusing the bedsides from my 72. Can anyone tell me what the dimensions are for the 1st Gen Jimmy/Blazers, if they have done something similar and if they foresee any issues?

TXJimmy