I think this qualifies as a mechanical question but let me know if I should move it.

I just bought, secondhand, a late-90s John Cherry steel mountain bike (it was called an "ATB bike"). You can see it here if you like: https://www.ebay.com/itm/mountain-bi...vip=true&rt=nc

I want to put a rigid fork on it. (It has a suspension fork right now). The original documentation says that the recommended offset and length for a rigid fork is 1 1/4" and 15 1/2" respectively. This translates to 32mm and 394mm.

This is what I've found on today's market

Maker | Length | Offset
Nashbar | 385 | 45
Origin8 | 400 | 45
Velo Orange | 400 | 57

I guess my question is, is it better to be a little long (400) or a little short (385), and does the fact that I can't find anything as low as the suggested offset matter. Thanks!