ROCK 4300-4355:
ROCK 4300-4314 - built 8-9/1976 - serial numbers 756136-1 thru 756136-15:
| ROCK 4300 | ROCK 4301 | ROCK 4302 | ROCK 4303 | ROCK 4304 |
| ROCK 4305 | ROCK 4306 | ROCK 4307 | ROCK 4308 | ROCK 4309 |
| ROCK 4310 | ROCK 4311 | ROCK 4312 | ROCK 4313 | ROCK 4314 |
ROCK 4315-4355 - built 9-11/1976 - serial numbers 757136-1 thru 757136-41: