Try & find a crossmember for a Sunny(B310) auto, which is pretty much identical to the 5 speed cross member. I use the Auto crossmember to put the larger 63A & stumpy 5 speeds behind L series motors. If you can get the 60 series 4 speed crossmember, it can be used with spacers & longer bolts between the crossmember & the floor. I found some very interesting spacers in R31 Skylines & Pintaras , they are C shaped, & are used to space down the gearbox. This is exactly what you want. With these you can start the bolt in before slipping the spacer washers in. Please fill in the location part of your profile so we can be a bit more specific with advise.