[Caponsacchi]

Hi all, I recently purchased an 87 944. I'm a total newbie here and this is my first post. Searching through the forum I've found some great info for helping with head gasket replacement--and my initial problem: a dead fuel pump relay. Question is (and I can't find the answer in the PET catalog) how long are the 2 front allen bolts by the temp switch supposed to be? Anyone have a part number? Or can I approximate with hardware store bolts and some washers? Soooo close to having this job done!