Try a local bolt shop.
Without a ruler for scale it's difficult to guess, possibly 1/4" UNF x 3/4". I'll have to have a look at a seat rail when I get a chance.
I've been stocking up on nuts, bolts & washers because I'm getting a good deal from the place I use at the moment
Colin
				
			 
			
		 
			
				
			
			
				'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
			
			
		 
	
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