<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Teri, First of all I have a 62 TR4, but I remember seeing a TR hardware catalog and I have found one on Triumph Experience. The nuts and bolts have part numbers and you will need a factory parts catalog to find those. <br id="lineBreakAtBeginningOfMessage"><div><br></div><div><blockquote type="cite"><p><font size="4" face="Adobe Garamond">I would like to replace the bolts that connects the mount to the plate on the frame</font></p></blockquote>Aren't these studs integral to the trans rubber mount? If so I think it is a 7/16 fine thread nut</div><div><blockquote type="cite"><p><font size="4" face="Adobe Garamond">and possibly the bolts that connect the frame plate to the frame.</font></p></blockquote>these are ones that I can’t find but I would guess they are 3/8 fine thread and if not then 5/16. 3/4” length </div><div><br></div><div>The big bolts trans to trans mount are #HB1112 1/2 x 1 1/2 fine, right side. #HB1115 is 1/2 x 1 7/8 left side when trans is fitted with the strap from bolt to gear shift.</div><div><br></div><div>Hopefully someone has a TR3 all apart and can give you a more definitive answer.</div><div></div></body></html>