Bolt sizes?

Can someone tell me the sizes of some bolts, or point me in the right direction of where to find the info, it's a 200 tdi, the bolts in question are the fixed mounting bolt for the alternator, I think its a 10 mm head, but doesn't look like M6 thread, and the others are the bumper mounting bolts, i want to remove the tatty looking bull bars but the bolts will have to be ground off or use a nut splitter and drive them out, i'd like to get the replacement bolts before i start either job, thanks

they could well be 1/4unf

I reckon they are an oddball that someone has bodged on, the ones on my 90 are M8 13mm spanner size.

slob said:

they could well be 1/4unf

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Thanks, have got a replacement for the alternator bolt, it's an M8 thread but 10 mm head, so i'm just using an M8 set pin with washers, still don't know about bumper bolts though

The bumper bolts should be 3/8 UNF, I think that they are 4" long but not 100% sure on that one.