Raiden Fighters Jet Heatsink?

[nam9]

So I bought a RFJ board recently for a good price, but as you can see, probably for a couple of reason:

The board is a proper SXX2G - i.e. the single board version with good audio. Board is sold fully working.
Firstly, the ROMS are all EPROMS... The SXX2G is unique to RFJ as far as I know - could this just be a US to JPN conversion? (It was bought in Japan).
Secondly... the heatsink is absent... All pictures I have seen of the single board model have heatsinks.

Is anyone with a single pcb Raiden Fighters (1,2 or Jet) able to give me some measurement of their heatsink? I think that would be a smart move to replace...

Thanks in advance!

 

[ic3b4ll]

It's original, the big RISE11 custom is unique to RFJ and the mask ROMs are actually SMD. Someone changed the EPROMs and or stickers. No issue with that.
I'll check the size of the heatsink when I have time. As long as the distance between screws is OK you should be fine. IIRC my board only has one screw on the heatsink anyway...

 

[nam9]

Appreciated @ic3b4ll